Add <-> (for class Block rw signature introducer) to Search box

[librasteve]

Problem or new feature

Typing <-> into the search box only shows results for infix:<-> (ie subtracttion operator)

It should also facilitate discovery of the class Block syntax set out here https://docs.raku.org/type/Block

A block can have a Signature between -> or <-> and the block:

Suggestions

Please add a new entry for <-> to the search box

I also suggest an additional -> entry that also points to the class Block page

[finanalyst]

@coke @librasteve IMHO this is a content issue, not a build issue. The desired behaviour can be achieved by adding X<> to type/Block eg

between X« -> | Block argument pointy» or X«<->| Block argument rw pointy» and the block 

All X<> markup is then picked up automatically and inserted in to the search data and into the Index