fix several typos in documentation and comments (#12553)

lib/packages/docutils/rst.nim

@@ -1605,7 +1605,7 @@ proc dirCodeBlock(p: var RstParser, nimExtension = false): PRstNode =
   ## <http://docutils.sourceforge.net/docs/ref/rst/directives.html#code>`_ and
   ## the nim extension ``.. code-block::``. If the block is an extension, we
   ## want the default language syntax highlighting to be Nim, so we create a
-  ## fake internal field to comminicate with the generator. The field is named
+  ## fake internal field to communicate with the generator. The field is named
   ## ``default-language``, which is unlikely to collide with a field specified
   ## by any random rst input file.
   ##

lib/packages/docutils/rstgen.nim

@@ -660,7 +660,7 @@ proc mergeIndexes*(dir: string): string =
   ## As convention this proc will split index files into two categories:
   ## documentation and API. API indices will be all joined together into a
   ## single big sorted index, making the bulk of the final index. This is good
-  ## for API documentation because many symbols are repated in different
+  ## for API documentation because many symbols are repeated in different
   ## modules. On the other hand, documentation indices are essentially table of
   ## contents plus a few special markers. These documents will be rendered in a
   ## separate section which tries to maintain the order and hierarchy of the