fix up alignment

Author: nickdesaulniers

libc/docs/CMakeLists.txt

@@ -63,7 +63,7 @@ if (SPHINX_FOUND)
       # docgen invocation.
       add_custom_target(${stem_rst}
         COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../utils/docgen/docgen.py ${stem}.h >
-        ${CMAKE_CURRENT_BINARY_DIR}/headers/${stem}.rst)
+                ${CMAKE_CURRENT_BINARY_DIR}/headers/${stem}.rst)
       # depend on the docgen invocation.
       add_dependencies(docs-libc-html ${stem_rst})
     endforeach()