doc: camelCase the i18n config variables to improve readability

The i18n config variable used weren't readable as they were in
the crude form of how git stores/uses it's config variables.

Improve it's readability by replacing them with camelCased versions
of config variables as it doesn't have any impact on it's usage.

Signed-off-by: Kaartic Sivaraam <kaarticsivaraam91196@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Documentation/i18n.txt

@@ -42,11 +42,11 @@ mind.
 +
 ------------
 [i18n]
-	commitencoding = ISO-8859-1
+	commitEncoding = ISO-8859-1
 ------------
 +
 Commit objects created with the above setting record the value
-of `i18n.commitencoding` in its `encoding` header.  This is to
+of `i18n.commitEncoding` in its `encoding` header.  This is to
 help other people who look at them later.  Lack of this header
 implies that the commit log message is encoded in UTF-8.
 
@@ -54,15 +54,15 @@ implies that the commit log message is encoded in UTF-8.
   `encoding` header of a commit object, and try to re-code the
   log message into UTF-8 unless otherwise specified.  You can
   specify the desired output encoding with
-  `i18n.logoutputencoding` in `.git/config` file, like this:
+  `i18n.logOutputEncoding` in `.git/config` file, like this:
 +
 ------------
 [i18n]
-	logoutputencoding = ISO-8859-1
+	logOutputEncoding = ISO-8859-1
 ------------
 +
 If you do not have this configuration variable, the value of
-`i18n.commitencoding` is used instead.
+`i18n.commitEncoding` is used instead.
 
 Note that we deliberately chose not to re-code the commit log
 message when a commit is made to force UTF-8 at the commit