Rewrite bind spec parser

man/man1/fzf.1

@@ -1049,6 +1049,8 @@ that case, you can use any of the following alternative notations to avoid
 parse errors.
 
     \fBaction-name[...]\fR
+    \fBaction-name{...}\fR
+    \fBaction-name<...>\fR
     \fBaction-name~...~\fR
     \fBaction-name!...!\fR
     \fBaction-name@...@\fR