[doc] update ROADMAP.rst and fix spelling mistake

Change-Id: If84b9aaebe999539d92d560034592678f8460155

ROADMAP.rst

@@ -1,6 +1,7 @@
 Current Release Changes
 =======================
 
+* Retry :meth:`data.sparql.SparqlQuery.query` on internal server error (500) (:phab:`T378788`)
 * Extract :meth:`APISite.linktrail()<pywikibot.site._apisite.APISite.linktrail>`
   for hr-wiki (:phab:`T378787`)
 
@@ -75,7 +76,7 @@ Pending removal in Pywikibot 10
 * 7.3.0: Old color escape sequences like ``\03{color}`` is deprecated in favour of new color format like <<color>>
 * 7.3.0: ``linktrail`` method of :class:`family.Family` is deprecated; use :meth:`APISite.linktrail()
   <pywikibot.site._apisite.APISite.linktrail>` instead
-* 7.2.0: Positional arguments *decoder*, *layer* and *newline* for :mod:`logging` functions where dropped; keyword
+* 7.2.0: Positional arguments *decoder*, *layer* and *newline* for :mod:`logging` functions were dropped; keyword
   arguments must be used instead.
 * 7.2.0: ``tb`` parameter of :func:`exception()<pywikibot.logging.exception>` function was renamed to ``exc_info``
 * 7.2.0: XMLDumpOldPageGenerator is deprecated in favour of a ``content`` parameter of