Merge pull request #1261 from titsuki/single-argument-rule-slurpy

Add an index for Single Argument Rule Slurpy

Author: titsuki

doc/Type/Signature.pod6

@@ -428,6 +428,7 @@ The double asterisk slurpy hides the nested comma objects and leaves them as-is
 in the slurpy array.
 
 =head3 Single Argument Rule Slurpy
+X<|+ (Single Argument Rule Slurpy)>
 
 A slurpy parameter created using a plus engages the "single argument rule",
 which decides how to handle the slurpy argument based upon context. Basically,