spelling: fix various misspellings

These were found by the check spelling action[1] and reported
here[2].

PR #1685 

[1] - https://github.com/marketplace/actions/check-spelling
[2] - 6f02d05671 (commitcomment-42625778)

benchsuite/benchsuite

@@ -894,7 +894,7 @@ class Result(object):
         '''
         Create a new set of results, initially empty.
 
-        :param Benchmarl benchmark:
+        :param Benchmark benchmark:
             The benchmark that produced these results.
         '''
         self.benchmark = benchmark