Added a missing "|" in the grammar productions used in the reference manual (reported by François Pinard). Added some missing "_" characters in the same cluster of productions. Added missing floor division operator in m_expr production, and mention floor division in the relevant portion of the text.
Added a missing "|" in the grammar productions used in the reference manual
(reported by François Pinard).
Added some missing "_" characters in the same cluster of productions.
Added missing floor division operator in m_expr production, and mention
floor division in the relevant portion of the text.

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator