Rename docs/*.md => docs/*.txt

The documentation uses features of Python-Markdown that are not supported on
GitHub and it's better to get a source view of the docs anyway. For example,
that way comments and bug reports can reference a specific line of a file.

Of course, it makes sense for Github to render the README, so that is left
with the `.md` file extension.

1 files changed, 37 insertions, 0 deletions

diff --git a/docs/extensions/smart_strong.txt b/docs/extensions/smart_strong.txt
new file mode 100644
index 0000000..8de574f
--- /dev/null
+++ b/docs/extensions/smart_strong.txt
@@ -0,0 +1,37 @@
+title:      Smart Strong Extension
+prev_title: Tables Extension
+prev_url:   tables.html
+next_title: CodeHilite Extension
+next_url:   code_hilite.html
+
+Smart_Strong
+============
+
+Summary
+-------
+
+The Markdown Smart_Strong Extension adds smarter handling of double underscores
+within words. This does for double underscores what 
+[smart_emphasis](../reference.html#smart_emphasis) does for single underscores.
+
+The Smart_Strong Extension is included in the standard Markdown library.
+
+Usage
+-----
+
+    >>> import markdown
+    >>> markdown.markdown('Text with double__underscore__words.', \
+                          extensions=['smart_strong'])
+    u'<p>Text with double__underscore__words.</p>'
+    >>> markdown.markdown('__Strong__ still works.', \
+                          extensions=['smart_strong'])
+    u'<p><strong>Strong</strong> still works.</p>'
+    >>> markdown.markdown('__this__works__too__.', \
+                          extensions=['smart_strong'])
+    u'<p><strong>this__works__too</strong>.</p>'
+
+This extension is also included with the [Extra](extra.html) Extension. You may
+call that extension to get this behavior with all the other features of 'Extra'.
+
+    >>> markdown.markdown(text, extensions=['extra'])
+