Update clients.mdx table header links

This replaces absolute URLs with paths, links the "Roots" column header,
and moves anchor definitions for the table header links to the top for
organizational purposes.

Closes modelcontextprotocol#525

Co-authored-by: Andrew Qu <[email protected]>

Author: jonathanhefner

docs/clients.mdx

@@ -11,7 +11,7 @@ This page provides an overview of applications that support the Model Context Pr
 
 {/* prettier-ignore-start */}
 
-| Client                                           | [Resources] | [Prompts] | [Tools] | [Discovery][Discovery] | [Sampling] | Roots | Notes                                                                                           |
+| Client                                           | [Resources] | [Prompts] | [Tools] | [Discovery] | [Sampling] | [Roots] | Notes                                                                                           |
 | ------------------------------------------------ | ----------- | --------- | ------- | ---------------------- | ---------- | ----- | ----------------------------------------------------------------------------------------------- |
 | [5ire][5ire]                                     | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | Supports tools.                                                                                 |
 | [AgentAI][AgentAI]                               | ❌          | ❌        | ✅      | ❓                     | ❌         | ❌    | Agent Library written in Rust with tools support                                                |
@@ -72,6 +72,12 @@ This page provides an overview of applications that support the Model Context Pr
 
 {/* prettier-ignore-end */}
 
+[Resources]: /docs/concepts/resources
+[Prompts]: /docs/concepts/prompts
+[Tools]: /docs/concepts/tools
+[Discovery]: /docs/concepts/tools#tool-discovery-and-updates
+[Sampling]: /docs/concepts/sampling
+[Roots]: /docs/concepts/roots
 [5ire]: https://github.com/nanbingxyz/5ire
 [AgentAI]: https://github.com/AdamStrojek/rust-agentai
 [AgenticFlow]: https://agenticflow.ai/mcp
@@ -127,12 +133,7 @@ This page provides an overview of applications that support the Model Context Pr
 [Witsy]: https://github.com/nbonamy/witsy
 [Zed]: https://zed.dev
 [Zencoder]: https://zencoder.ai
-[Resources]: https://modelcontextprotocol.io/docs/concepts/resources
-[Prompts]: https://modelcontextprotocol.io/docs/concepts/prompts
-[Tools]: https://modelcontextprotocol.io/docs/concepts/tools
-[Sampling]: https://modelcontextprotocol.io/docs/concepts/sampling
 [HyperAgent]: https://github.com/hyperbrowserai/HyperAgent
-[Discovery]: /docs/concepts/tools#tool-discovery-and-updates
 
 </div>