Fix meantim typo

Author: graingert

ci/build_docs.sh

@@ -14,7 +14,7 @@ fi
 
 if [ x"$DOC_BUILD" != x"" ]; then
 
-    # we're running network tests, let's build the docs in the meantim
+    # we're running network tests, let's build the docs in the meantime
     echo "Will build docs"
     conda install sphinx==1.1.3 ipython