Sync with 'maint'

* maint:
  Correct common spelling mistakes in comments and tests
  kwset: fix spelling in comments
  precompose-utf8: fix spelling of "want" in error message
  compat/nedmalloc: fix spelling in comments
  compat/regex: fix spelling and grammar in comments
  obstack: fix spelling of similar
  contrib/subtree: fix spelling of accidentally
  git-remote-mediawiki: spelling fixes
  doc: various spelling fixes
  fast-export: fix argument name in error messages
  Documentation: distinguish between ref and offset deltas in pack-format
  i18n: make the translation of -u advice in one go

perl/Git.pm

@@ -1180,7 +1180,7 @@ my (%TEMP_FILEMAP, %TEMP_FILES);
 
 =item temp_acquire ( NAME )
 
-Attempts to retreive the temporary file mapped to the string C<NAME>. If an
+Attempts to retrieve the temporary file mapped to the string C<NAME>. If an
 associated temp file has not been created this session or was closed, it is
 created, cached, and set for autoflush and binmode.
 

perl/Git/I18N.pm

@@ -68,7 +68,7 @@ Git::I18N - Perl interface to Git's Gettext localizations
 
 	print __("Welcome to Git!\n");
 
-	printf __("The following error occured: %s\n"), $error;
+	printf __("The following error occurred: %s\n"), $error;
 
 =head1 DESCRIPTION
 

perl/private-Error.pm

@@ -769,7 +769,7 @@ is a numeric value. These values are what will be returned by the
 overload methods.
 
 If the text value ends with C<at file line 1> as $@ strings do, then
-this infomation will be used to set the C<-file> and C<-line> arguments
+this information will be used to set the C<-file> and C<-line> arguments
 of the error object.
 
 This class is used internally if an eval'd block die's with an error