Fix broken relative links

Signed-off-by: Yuki Okushi <[email protected]>

Author: JohnTitor

src/implementing_new_features.md

@@ -33,7 +33,7 @@ like this; for example, the compiler team recommends
 filing a Major Change Proposal ([MCP][mcp]) as a lightweight way to
 garner support and feedback without requiring full consensus.
 
-[mcp]: compiler/mcp.md#public-facing-changes-require-rfcbot-fcp
+[mcp]: https://forge.rust-lang.org/compiler/mcp.html#public-facing-changes-require-rfcbot-fcp
 
 You don't need to have the implementation fully ready for r+ to propose an FCP,
 but it is generally a good idea to have at least a proof

src/solve/the-solver.md

@@ -12,6 +12,6 @@ While the actual solver is not fully pure to deal with overflow and cycles, we a
 going to defer that for now.
 
 To deal with inference variables and to improve caching, we use
-[canonicalization](/canonicalization.html).
+[canonicalization](./canonicalization.md).
 
-TODO: write the remaining code for this as well.
+TODO: write the remaining code for this as well.

src/solve/trait-solving.md

@@ -2,7 +2,7 @@
 
 This chapter describes how trait solving works with the new WIP solver located in
 [`rustc_trait_selection/solve`][solve]. Feel free to also look at the docs for
-[the current solver](../traits/resolution.hmtl) and [the chalk solver](./chalk.html)
+[the current solver](../traits/resolution.md) and [the chalk solver](../traits/chalk.md)
 can be found separately.
 
 ## Core concepts