Remove extra whitespace in method signature params

[jonathanhefner]

RDoc includes extra whitespace in a method's parameter list when the the method's def statement is spread across multiple lines. For example, a def like:

def define_attribute(
  name,
  cast_type,
  default: NO_DEFAULT_PROVIDED,
  user_provided_default: true
)
  # ...
end

Would produce a parameter list like:

( name, cast_type, default: NO_DEFAULT_PROVIDED, user_provided_default: true )

This commit monkey-patches RDoc::AnyMethod#params to remove the extra whitespace within the parentheses:

(name, cast_type, default: NO_DEFAULT_PROVIDED, user_provided_default: true)

This is implemented as a monkey patch so that it fixes params for rendered method docs as well as search index entries.

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