Incorrect example in Vocal Music documentation

[Greg Swinford]

There is an error in the example given on the following documentation page:
http://lilypond.org/doc/v2.18/Documentation/notation/opera-and-stage-musicals#dialogue-over-music

\override LyricText.self-alignment-X = #LEFT should read
\override LyricText #'self-alignment-X = #LEFT

otherwise the following error occurs:

error: syntax error, unexpected '.', expecting SCM_FUNCTION or
SCM_IDENTIFIER or SCM_TOKEN
          \with { \override LyricText
                                     .self-alignment-X = #LEFT }

I presume the same error would occur with the font-shape definition above
this too, but I haven't tested this.

Thanks,
Greg.