Don't use caps (#31829)

dsaxton · web-flow · commit 39e9b350c1c4 · 2020-02-09T17:26:18.000-05:00
diff --git a/doc/source/user_guide/boolean.rst b/doc/source/user_guide/boolean.rst
@@ -9,7 +9,7 @@
 .. _boolean:
 
 **************************
-Nullable Boolean Data Type
+Nullable Boolean data type
 **************************
 
 .. versionadded:: 1.0.0
