Tidy up comments from dd4f7d5c51c7 (zlib compression dictionary support).
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index 102740b..a44ed0d 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -619,7 +619,7 @@
             RetVal = NULL;
             goto error;
         }
-        /* repeat the call to inflate! */
+        /* Repeat the call to inflate. */
         Py_BEGIN_ALLOW_THREADS
         err = inflate(&(self->zst), Z_SYNC_FLUSH);
         Py_END_ALLOW_THREADS