fix some typos in the doc

llvm-svn: 342628
diff --git a/libcxx/docs/conf.py b/libcxx/docs/conf.py
index f532e30..50b372c 100644
--- a/libcxx/docs/conf.py
+++ b/libcxx/docs/conf.py
@@ -241,7 +241,7 @@
 #texinfo_show_urls = 'footnote'
 
 
-# FIXME: Define intersphinx configration.
+# FIXME: Define intersphinx configuration.
 intersphinx_mapping = {}