test/Utils.hs: fix capitalization in docstring comment

Signed-off-by: Dato Simó <dato@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

test/hs/Test/Ganeti/Utils.hs

@@ -207,7 +207,7 @@ prop_niceSortKey_equiv =
                                                     zip numbers names)
   ]
 
--- | Tests 'rstripSpace'.
+-- | Tests 'rStripSpace'.
 prop_rStripSpace :: NonEmptyList Char -> Property
 prop_rStripSpace (NonEmpty str) =
   forAll (resize 50 $ listOf1 (arbitrary `suchThat` isSpace)) $ \whitespace ->