fix too much long anchor in rdoc
fix too much long anchor in rdoc

To clarify anchor word, add separator(space).

suzuki/review,masawada/review,orangain/review,kuad9/review_study,krororo/review,kmuto/review,takahashim/review,kuad9/review_study,murashitas/review,suzuki/review,kmuto/review,kmuto/review,takahashim/review,murashitas/review,masawada/review,krororo/review,orangain/review,krororo/review