Update TeX.gitignore to be in alphabetical order

TeX.gitignore

@@ -72,12 +72,6 @@
 # nomencl
 *.nlo
 
-# todonotes
-*.tdo
-
-# xindy
-*.xdy
-
 # sagetex
 *.sagetex.sage
 *.sagetex.py
@@ -88,3 +82,10 @@
 *.sympy
 sympy-plots-for-*.tex/
 
+# todonotes
+*.tdo
+
+# xindy
+*.xdy
+
+