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
@node Text markup commands
@appendixsec Text markup commands
@node Text markup commands
@appendixsec Text markup commands
+@ignore
+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.
+@end ignore
+
@include markup-commands.tely
@include markup-commands.tely