fix two typos in the doc

llvm-svn: 274447
diff --git a/clang/docs/SourceBasedCodeCoverage.rst b/clang/docs/SourceBasedCodeCoverage.rst
index b255bd7..8d0a51f 100644
--- a/clang/docs/SourceBasedCodeCoverage.rst
+++ b/clang/docs/SourceBasedCodeCoverage.rst
@@ -111,7 +111,7 @@
     # Step 3(b): Create a line-oriented coverage report.
     % llvm-cov show ./foo -instr-profile=foo.profdata
 
-To demangle any C++ identifiers in the ouput, use:
+To demangle any C++ identifiers in the output, use:
 
 .. code-block:: console