Allow instance variable annotations between class members

[ksss]

Fix #3175

Summary

Instance variable annotations written between class/module members were reported as unused. Only the ones before the first member or after the last member worked.

class Foo
  def a
  end

  # @rbs @x: Integer    # <- Unused inline rbs annotation

  def b
  end

  # @rbs @y: String     # <- works
end

Why

visit_class_or_module_body reports comments enclosed in the child nodes of the class/module node as unused. The body is a single StatementsNode spanning from the first statement to the last one, so every comment between statements was treated as enclosed. This change looks into each statement of the body instead.

A class body with rescue/ensure (BeginNode) is left as before.

Also added a note to docs/inline.md that the declarations need a blank line before the following member, since a comment block directly above a def/attr_* belongs to that member.

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