Doc: notation-appendices.itely - added 2 Clefs (issue 104520043 by address@hidden)

[markpolesky]

https://codereview.appspot.com/104520043/diff/1/Documentation/notation/notation-appendices.itely
File Documentation/notation/notation-appendices.itely (right):

https://codereview.appspot.com/104520043/diff/1/Documentation/notation/notation-appendices.itely#newcode1489
Documentation/notation/notation-appendices.itely:1489: @tab
For the last two entries, this makes better sense to me:

@tab
@code{\clef tab}
@tab
@lilypond[line-width=3\cm,notime,ragged-right,relative=1]
\new TabStaff {
  \clef tab
  c1
}
@end lilypond

@item
@code{\clef moderntab}
@tab
@lilypond[line-width=3\cm,notime,ragged-right,relative=1]
\new TabStaff {
  \clef moderntab
  c1
}
@end lilypond

https://codereview.appspot.com/104520043/