Fix two typos in the doc

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@160763 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/docs/InternalsManual.html b/docs/InternalsManual.html
index c6df19c..3f3e124 100644
--- a/docs/InternalsManual.html
+++ b/docs/InternalsManual.html
@@ -1704,7 +1704,7 @@
 <li><b><tt>__extension__</tt></b>: The expression form of this extension causes
     any evaluatable subexpression to be accepted as an integer constant
     expression.</li>
-<li><b><tt>__builtin_constant_p</tt></b>: This returns true (as a integer
+<li><b><tt>__builtin_constant_p</tt></b>: This returns true (as an integer
     constant expression) if the operand evaluates to either a numeric value
     (that is, not a pointer cast to integral type) of integral, enumeration,
     floating or complex type, or if it evaluates to the address of the first