[docs][msan] Improve language consistency

Author: vitalybuka

clang/docs/MemorySanitizer.rst

@@ -17,7 +17,7 @@ Here is a not comprehensive of list cases when MemorySanitizer will report an er
 
 * Uninitialized value was used in a conditional branch.
 * Uninitialized pointer was used for memory accesses.
-* Uninitialized value passed or returned from a function call, which is considered an undefined behavior. The check can be disabled with ``-fno-sanitize-memory-param-retval``.
+* Uninitialized value was passed or returned from a function call, which is considered an undefined behavior. The check can be disabled with ``-fno-sanitize-memory-param-retval``.
 * Uninitialized data was passed into some libc calls.
 
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