docs/differences/index_template: Use consistent heading casing.

pfalcon · pfalcon · commit 50eea2614510 · 2017-07-01T21:15:43.000+03:00
And in our case, "consistent" is where each word in the heading is *not*
capitalized.
diff --git a/docs/differences/index_template.txt b/docs/differences/index_template.txt
@@ -1,4 +1,4 @@
-MicroPython Differences from CPython
+MicroPython differences from CPython
 ====================================
 
 The operations listed in this section produce conflicting results in MicroPython when compared to standard Python.

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-MicroPython Differences from CPython`
	`1`	`+MicroPython differences from CPython`
`2`	`2`	`====================================`
`3`	`3`
`4`	`4`	`The operations listed in this section produce conflicting results in MicroPython when compared to standard Python.`