Remove unnecessary explicit title anchors and use relative links instead (#20620)

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

docs/design/kernel/paged_attention.md

@@ -1,7 +1,6 @@
 ---
 title: vLLM Paged Attention
 ---
-[](){ #design-paged-attention }
 
 Currently, vLLM utilizes its own implementation of a multi-head query
 attention kernel (`csrc/attention/attention_kernels.cu`).