Fix links in the manual

doc/manual/source/development/building.md

@@ -66,7 +66,7 @@ You can also build Nix for one of the [supported platforms](#platforms).
 This section assumes you are using Nix with the [`flakes`] and [`nix-command`] experimental features enabled.
 
 [`flakes`]: @docroot@/development/experimental-features.md#xp-feature-flakes
-[`nix-command`]: @docroot@/development/experimental-features.md#xp-nix-command
+[`nix-command`]: @docroot@/development/experimental-features.md#xp-feature-nix-command
 
 To build all dependencies and start a shell in which all environment variables are set up so that those dependencies can be found:
 
@@ -256,7 +256,7 @@ You can use any of the other supported environments in place of `nix-cli-ccacheS
 ## Editor integration
 
 The `clangd` LSP server is installed by default on the `clang`-based `devShell`s.
-See [supported compilation environments](#compilation-environments) and instructions how to set up a shell [with flakes](#nix-with-flakes) or in [classic Nix](#classic-nix).
+See [supported compilation environments](#compilation-environments) and instructions how to set up a shell [with flakes](#building-nix-with-flakes) or in [classic Nix](#building-nix).
 
 To use the LSP with your editor, you will want a `compile_commands.json` file telling `clangd` how we are compiling the code.
 Meson's configure always produces this inside the build directory.

doc/manual/source/development/testing.md

@@ -119,7 +119,7 @@ This will:
 
 3. Stop the program when the test fails, allowing the user to then issue arbitrary commands to GDB.
 
-### Characterisation testing { #characaterisation-testing-unit }
+### Characterisation testing { #characterisation-testing-unit }
 
 See [functional characterisation testing](#characterisation-testing-functional) for a broader discussion of characterisation testing.