DOC: Update user_explain\text\README.txt to reference example page

* Minor changes to user_explain\text\README.txt
Wanted to implement a redirect to the examples' page for text, labels, and annotations, similar to the user_explain\colors\README.txt

* Minor changes to user_explain\text\README.txt
Wanted to implement a redirect to the examples' page for text, labels, and annotations, similar to the user_explain\colors\README.txt

* Some minor typo/text changes in text/README.txt.
Some capitalization issues, or capitalizing certain words (TrueType) that is typically capitalized

Author: mattymo30

galleries/users_explain/text/README.txt

@@ -5,8 +5,10 @@
 Text
 ----
 
-matplotlib has extensive text support, including support for
-mathematical expressions, truetype support for raster and
+Matplotlib has extensive text support, including support for
+mathematical expressions, TrueType support for raster and
 vector outputs, newline separated text with arbitrary
 rotations, and Unicode support. These tutorials cover
 the basics of working with text in Matplotlib.
+
+For even more information see the :ref:`examples page <text_labels_and_annotations>`.