Code review feedback

Author: eugeneepshteyn

flang/docs/Directives.md

@@ -18,10 +18,10 @@ A list of non-standard directives supported by Flang
   directive allow actual arguments that would otherwise be diagnosed as
   incompatible in type (T), kind (K), rank (R), CUDA device (D), or managed (M)
   status. The letter (A) is a shorthand for (TKRDM), and is the default when no
-  letters appear. The letter (C) checks for contiguity for example allowing an
+  letters appear. The letter (C) checks for contiguity, for example allowing an
   element of an assumed-shape array to be passed as a dummy argument. The
   letter (P) ignores pointer and allocatable matching, so that one can pass an
-  allocatable array to routine with pointer array argument and vice-versa. For
+  allocatable array to routine with pointer array argument and vice versa. For
   example, if one wanted to call a "set all bytes to zero" utility that could
   be applied to arrays of any type or rank:
 ```