Update the param mutation anchor

[erran]

No description provided.

[bbatsov]

Better change param to arg for consistency with the rule itself.

[erran]

Ah, interesting cf0d2be (from #378) converted several usages of argument/arg to parameter/param. I guess in addition to one half of the anchor this rule was left as arguments.

Do not mutate arguments unless that is the purpose of the method.

Should I update the anchor/anchor link to this rule or convert it to use parameters such as the other rules updated in #378?

[erran]

When writing a method's signature (declaring the method), the values being passed to a method are called parameters, not arguments. When calling a method, the values passed to the call are formally known as arguments. – @sethkrasnianski

With this in mind I'd say that parameters would be correct here since this rule refers to them being mutated within a method.

[bbatsov]

Fair enough.

[sethkrasnianski]

👍