runtime: Fix typos in various files

closes: #12836

Signed-off-by: Christian Brabandt <cb@256bit.org>
Co-authored-by: Viktor Szépe <viktor@szepe.net>
diff --git a/runtime/ftplugin/readline.vim b/runtime/ftplugin/readline.vim
index eba7122..524eeb7 100644
--- a/runtime/ftplugin/readline.vim
+++ b/runtime/ftplugin/readline.vim
@@ -25,7 +25,7 @@
 endif
 
 if (has("gui_win32") || has("gui_gtk")) && !exists("b:browsefilter")
-  let b:browsefilter = "Readline Intialization Files (inputrc .inputrc)\tinputrc;*.inputrc\n" ..
+  let b:browsefilter = "Readline Initialization Files (inputrc .inputrc)\tinputrc;*.inputrc\n" ..
 	\	       "All Files (*.*)\t*.*\n"
   let b:undo_ftplugin ..= " | unlet! b:browsefilter"
 endif