[Doc]: Improve feature tables (#13224)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

docs/source/features/compatibility_matrix.md

@@ -4,8 +4,14 @@
 
 The tables below show mutually exclusive features and the support on some hardware.
 
+The symbols used have the following meanings:
+
+- ✅ = Full compatibility
+- 🟠 = Partial compatibility
+- ❌ = No compatibility
+
 :::{note}
-Check the '✗' with links to see tracking issue for unsupported feature/hardware combination.
+Check the ❌ or 🟠 with links to see tracking issue for unsupported feature/hardware combination.
 :::
 
 ## Feature x Feature
@@ -29,6 +35,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
 :header-rows: 1
 :stub-columns: 1
 :widths: auto
+:class: vertical-table-header
 
 - * Feature
   * [CP](#chunked-prefill)
@@ -48,7 +55,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * beam-search
   * <abbr title="Guided Decoding">guided dec</abbr>
 - * [CP](#chunked-prefill)
-  *
+  * ✅
   *
   *
   *
@@ -66,7 +73,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   *
 - * [APC](#automatic-prefix-caching)
   * ✅
-  *
+  * ✅
   *
   *
   *
@@ -82,9 +89,9 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   *
   *
 - * [LoRA](#lora-adapter)
-  * [✗](gh-pr:9057)
   * ✅
-  *
+  * ✅
+  * ✅
   *
   *
   *
@@ -102,7 +109,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  *
+  * ✅
   *
   *
   *
@@ -118,9 +125,9 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
 - * [SD](#spec_decode)
   * ✅
   * ✅
-  * ✗
+  * ❌
+  * ✅
   * ✅
-  *
   *
   *
   *
@@ -138,7 +145,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  *
+  * ✅
   *
   *
   *
@@ -150,13 +157,13 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   *
   *
 - * <abbr title="Pooling Models">pooling</abbr>
-  * ✗
-  * ✗
-  * ✗
-  * ✗
-  * ✗
-  * ✗
-  *
+  * ❌
+  * ❌
+  * ❌
+  * ❌
+  * ❌
+  * ❌
+  * ✅
   *
   *
   *
@@ -167,14 +174,14 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   *
   *
 - * <abbr title="Encoder-Decoder Models">enc-dec</abbr>
-  * ✗
-  * [✗](gh-issue:7366)
-  * ✗
-  * ✗
-  * [✗](gh-issue:7366)
+  * ❌
+  * [❌](gh-issue:7366)
+  * ❌
+  * ❌
+  * [❌](gh-issue:7366)
+  * ✅
   * ✅
   * ✅
-  *
   *
   *
   *
@@ -190,9 +197,9 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ✗
+  * ❌
+  * ✅
   * ✅
-  *
   *
   *
   *
@@ -205,12 +212,12 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * [✗](gh-pr:8199)
-  * ✅
-  * ✗
   * ✅
   * ✅
-  *
+  * ❌
+  * ✅
+  * ✅
+  * ✅
   *
   *
   *
@@ -222,49 +229,49 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ✗
+  * ❌
+  * ✅
+  * ❌
+  * ❌
   * ✅
-  * ✗
-  * ✗
   * ✅
   * ✅
-  *
   *
   *
   *
   *
   *
 - * multi-step
-  * ✗
+  * ❌
   * ✅
-  * ✗
+  * ❌
+  * ✅
+  * ❌
+  * ✅
+  * ❌
+  * ❌
   * ✅
-  * ✗
   * ✅
-  * ✗
-  * ✗
   * ✅
-  * [✗](gh-issue:8198)
   * ✅
-  *
   *
   *
   *
   *
 - * <abbr title="Multimodal Inputs">mm</abbr>
   * ✅
-  * [✗](gh-pr:8348)
-  * [✗](gh-pr:7199)
-  * ?
-  * ?
+  * [🟠](gh-pr:8348)
+  * [🟠](gh-pr:4194)
+  * ❔
+  * ❔
   * ✅
   * ✅
   * ✅
   * ✅
   * ✅
   * ✅
-  * ?
-  *
+  * ❔
+  * ✅
   *
   *
   *
@@ -273,16 +280,16 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * [✗](gh-issue:6137)
+  * [❌](gh-issue:6137)
   * ✅
-  * ✗
+  * ❌
   * ✅
   * ✅
   * ✅
-  * ?
-  * [✗](gh-issue:7968)
+  * ❔
+  * [❌](gh-issue:7968)
+  * ✅
   * ✅
-  *
   *
   *
 - * beam-search
@@ -290,35 +297,35 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * [✗](gh-issue:6137)
+  * [❌](gh-issue:6137)
   * ✅
-  * ✗
+  * ❌
   * ✅
   * ✅
   * ✅
-  * ?
-  * [✗](gh-issue:7968)
-  * ?
+  * ❔
+  * [❌](gh-issue:7968)
+  * ❔
+  * ✅
   * ✅
-  *
   *
 - * <abbr title="Guided Decoding">guided dec</abbr>
   * ✅
   * ✅
-  * ?
-  * ?
-  * [✗](gh-issue:11484)
+  * ❔
+  * ❔
+  * [❌](gh-issue:11484)
   * ✅
-  * ✗
-  * ?
+  * ❌
+  * ❔
   * ✅
   * ✅
   * ✅
-  * [✗](gh-issue:9893)
-  * ?
+  * [❌](gh-issue:9893)
+  * ❔
+  * ✅
   * ✅
   * ✅
-  *
 :::
 
 (feature-x-hardware)=
@@ -339,7 +346,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * CPU
   * AMD
 - * [CP](#chunked-prefill)
-  * [✗](gh-issue:2729)
+  * [❌](gh-issue:2729)
   * ✅
   * ✅
   * ✅
@@ -347,7 +354,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
 - * [APC](#automatic-prefix-caching)
-  * [✗](gh-issue:3687)
+  * [❌](gh-issue:3687)
   * ✅
   * ✅
   * ✅
@@ -368,7 +375,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * [✗](gh-issue:8475)
+  * [❌](gh-issue:8475)
   * ✅
 - * [SD](#spec_decode)
   * ✅
@@ -384,7 +391,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ✗
+  * ❌
   * ✅
 - * <abbr title="Pooling Models">pooling</abbr>
   * ✅
@@ -393,7 +400,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ?
+  * ❔
 - * <abbr title="Encoder-Decoder Models">enc-dec</abbr>
   * ✅
   * ✅
@@ -401,7 +408,7 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ✗
+  * ❌
 - * <abbr title="Multimodal Inputs">mm</abbr>
   * ✅
   * ✅
@@ -432,15 +439,15 @@ Check the '✗' with links to see tracking issue for unsupported feature/hardwar
   * ✅
   * ✅
   * ✅
-  * ✗
-  * ✗
+  * ❌
+  * ❌
 - * multi-step
   * ✅
   * ✅
   * ✅
   * ✅
   * ✅
-  * [✗](gh-issue:8477)
+  * [❌](gh-issue:8477)
   * ✅
 - * best-of
   * ✅