Fixed comment typo that causes the given comment to actually make sense.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184286 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/APFloat.cpp b/lib/Support/APFloat.cpp
index 2ad66c5..92c8b6d 100644
--- a/lib/Support/APFloat.cpp
+++ b/lib/Support/APFloat.cpp
@@ -687,7 +687,7 @@
 bool
 APFloat::isSmallest() const {
   // The smallest number by magnitude in our format will be the smallest
-  // denormal, i.e. the floating point normal with exponent being minimum
+  // denormal, i.e. the floating point number with exponent being minimum
   // exponent and significand bitwise equal to 1 (i.e. with MSB equal to 0).
   return isNormal() && exponent == semantics->minExponent &&
     significandMSB() == 0;