Fixed various typos.

Applied patch by snowleopard2 fixing a bunch of typos such as misspellings and double words in the documentation. Combined the patch with some local queued typos waiting to be committed as well as adding new typo fixes inspired by the patch.

Function names with American spelling were not changed nor was third-party code touched. The only code changes involve some changes in strings that are translated ("Can not" -> "Cannot").

Closes #13063 (again).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@67280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/mediactrl_am.cpp

@@ -1823,8 +1823,8 @@ void wxAMMediaBackend::FinishLoad()
 bool wxAMMediaBackend::ShowPlayerControls(wxMediaCtrlPlayerControls flags)
 {
     // Note that IMediaPlayer doesn't have a statusbar by
-    // default but IActiveMovie does - so lets try to keep
-    // the interface consistant
+    // default but IActiveMovie does - so let's try to keep
+    // the interface consistent.
     if(!flags)
     {
         GetAM()->put_Enabled(VARIANT_FALSE);