Change \partcombine (et al.) to \partCombine

Documentation/changes.tely

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 @setfilename lilypond-changes.info
 @settitle LilyPond Changes
 
 @include macros.itexi
 
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@@ skipping 44 matching lines @@
 * don't try to provide real-world examples, they often get too big,
 which scares away people.
 
 * Write complete sentences.
 
 * only show user-visible changes.
 
 @end ignore
 
 @item
+The @code{\\partcombine} command, as well as all @code{partCombine}-prefixed
+commands, subroutines and property names, are now written with a capital C,
+such as @code{\\partCombine}, @code{\\partCombineApart} etc.
+The @code{\\autochange} command is now also capitalized as @code{\\autoChange}.
+
+@item
 The @code{New_fingering_engraver} will now consider the
 @code{X-align-on-main-noteheads} property of the @code{self-alignment-interface}.
 If set to true (@code{##t}), all fingerings oriented @code{up} or @code{down}
 will be arranged in a straight column and aligned on the noteheads on the
 correct side of the stem:
 @lilypond[verbatim,quote]
 {
   \set fingeringOrientations = #'(up)
   <e'-1 d''-4 e''-5>4 <a'-1 b'-2 fis''-5>
   \set fingeringOrientations = #'(down)
@@ skipping 108 matching lines @@
 @ifhtml
 For older news, go to
 @uref{http://lilypond.org/doc/v2.20/Documentation/changes/},
 @uref{http://lilypond.org/doc/v2.18/Documentation/changes/},
 or @uref{../,go back} to the Documentation index.
 
 
 @end ifhtml
 
 @bye