Add note to manuals.html describing formats of manuals (Issue 2895) (issue 6867054)

[PhilEHolmes]

Reviewers: ,

Message:
Please review.  Passes make doc.

Description:
Describes how to access the different formats of the manuals on the
stable manuals page.

Please review this at https://codereview.appspot.com/6867054/

Affected files:
  M Documentation/web/manuals.itexi


Index: Documentation/web/manuals.itexi
diff --git a/Documentation/web/manuals.itexi  
b/Documentation/web/manuals.itexi
index  
a46ab720da6d11303708974ac47b2d4a3808a775..aa8ee11911de8c22b4f4b7fd916043b009e53e79  
100644
--- a/Documentation/web/manuals.itexi
+++ b/Documentation/web/manuals.itexi
@@ -26,6 +26,12 @@

 @divEnd

+The LilyPond manuals generally come in three formats: split HTML, big HTML  
and
+PDF.  Split HTML is good for reading online.  Big HTML (and some of these  
can be
+very big) contains the whole manual in a single page.  PDF is available for
+downloading and using offline.  To get to these 3 formats, follow the links
+that read @code{details of} and then the manual name.
+
 @divClass{link-headings}

 @divClass{column-center-top}