Also fix spelling mistakes in the documentation files

Run the same codespell command on docs directory.

docs/contributing/binary-compatibility.md

@@ -209,7 +209,7 @@ so a line like this could be added to version-script.in:
     \*wxGenericListCtrl*GetItemFont*;
 
 Allow for the fact that the name mangling is going to vary from compiler to
-complier.
+compiler.
 
 When adding a class you can match all the symbols it adds with a single
 pattern, so long as that pattern is not likely to also match other symbols.

docs/contributing/how-to-add-new-wxUSE_XXX.md

@@ -51,7 +51,7 @@ The following files need to be modified when adding a new `wxUSE_FOO`:
    section. Please keep the alphabetic order.
 
    If there are any dependencies, i.e. `wxUSE_FOO` requires `wxUSE_BAR` and
-   `wxUSE_BAZ`, check for thme here too.
+   `wxUSE_BAZ`, check for them here too.
 
 - `include/wx/msw/chkconf.h` for MSW-specific options
 

docs/contributing/how-to-release.md

@@ -177,7 +177,7 @@ E.g. to create documentation for `v3.0.z` release:
 ## Announcement
 
 Update https://www.wxwidgets.org:
-* Update release information (at least `version` and `released`) in `_data/relases.yml`.
+* Update release information (at least `version` and `released`) in `_data/releases.yml`.
 * Update the list of compilers used for making MSW binaries in
   `downloads/index.md` if necessary (note that there is no need to update
   anything else, the page will dynamically show the release files with the