Fixed error in demo.rst (readthedocs#421)

Author: Massimo Zaniboni

demo_docs/source/demo.rst

@@ -19,7 +19,7 @@ Paragraphs contain text and may contain inline markup: *emphasis*, **strong emph
 standalone hyperlinks (http://www.python.org), external hyperlinks (Python_), internal cross-references (example_),
 external hyperlinks with embedded URIs (`Python web site <http://www.python.org>`__), footnote references
 (manually numbered [1]_, anonymous auto-numbered [#]_, labeled auto-numbered [#label]_, or symbolic [*]_),
-citation references ([2]_), substitution references (|example|), and _`inline hyperlink targets`
+citation references ([12]_), substitution references (|example|), and _`inline hyperlink targets`
 (see Targets_ below for a reference back to here). Character-level inline markup is also possible
 (although exceedingly ugly!) in *re*\ ``Structured``\ *Text*. Problems are indicated by |problematic|
 text (generated by processing errors; this one is intentional).
@@ -264,15 +264,15 @@ Footnotes
 Citations
 ---------
 
-.. [1] This is the citation I made, let's make this extremely long so that we can tell that it doesn't follow the normal responsive table stuff.
+.. [11] This is the citation I made, let's make this extremely long so that we can tell that it doesn't follow the normal responsive table stuff.
 
-.. [2] This citation has some ``code blocks`` in it, maybe some **bold** and
-       *italics* too. Heck, lets put a link to a meta citation [3]_ too.
+.. [12] This citation has some ``code blocks`` in it, maybe some **bold** and
+       *italics* too. Heck, lets put a link to a meta citation [13]_ too.
 
-.. [3] This citation will have two backlinks.
+.. [13] This citation will have two backlinks.
 
 
-Here's a reference to the above, [2]_, and a [nonexistent]_ citation.
+Here's a reference to the above, [12]_, and a [nonexistent]_ citation.
 
 Here is another type of citation: `citation`