numeric.c: revise docs
* numeric.c: [DOC] revise docs for Numeric, Integer, Float: * nodoc Numeric#singleton_method_added * mention that result for Integer#** might also be Complex * add / simplify / fix some examples * mention aliases * fix rdoc formatting, typos, grammar * clarifications and other improvements git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58580 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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