Add doc-string for allowVoltaHook (issue 556640043 by address@hidden)

[thomasmorley65]

Reviewers: ,

Description:
Add doc-string for allowVoltaHook

Please review this at https://codereview.appspot.com/556640043/

Affected files (+1, -0 lines):
  M ly/property-init.ly


Index: ly/property-init.ly
diff --git a/ly/property-init.ly b/ly/property-init.ly
index  
e3ae2147be607304a7d3c4496b25f49b69ff0f88..5024260ca46d7f0f297f525e32a8ac7c026064a4  
100644
--- a/ly/property-init.ly
+++ b/ly/property-init.ly
@@ -758,6 +758,7 @@ voiceNeutralStyle = {

 allowVoltaHook =
 #(define-void-function (bar) (string?)
+  (_i "Allow the volta bracket hook being drawn over bar line @var{bar}.")
                        (allow-volta-hook bar))

 %% x notes