fix links on new trait solver

Author: Lukas Markeffsky

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.html) and [the chalk solver](../traits/chalk.html)
 can be found separately.
 
 ## Core concepts