Doc: add comment about automatically generated documentation (issue 321270043 by address@hidden)

[fedelogy]

Reviewers: ,

Description:
Doc: add comment about automatically generated documentation

This is mainly for translators. See this discussion:
http://lilypond-translations.3384276.n2.nabble.com/Doubt-about-ref-Align-in-text-itely-of-the-notationn-manual-td7572987.html

Please review this at https://codereview.appspot.com/321270043/

Affected files (+6, -0 lines):
  M Documentation/notation/notation-appendices.itely


Index: Documentation/notation/notation-appendices.itely
diff --git a/Documentation/notation/notation-appendices.itely  
b/Documentation/notation/notation-appendices.itely
index  
3ad971b807e68768b804c6908dd035408a855def..3aab2d451c0f5ea2f23ac594db03ac6f3147b290  
100644
--- a/Documentation/notation/notation-appendices.itely
+++ b/Documentation/notation/notation-appendices.itely
@@ -1495,6 +1495,12 @@ c1
 @node Text markup commands
 @appendixsec Text markup commands

address@hidden
+All the .tely files included in this appendix are automatically
+generated from source files during the build.
+For translators: you cannot translate the content of these files.
address@hidden ignore
+
 @include markup-commands.tely