regexp/syntax: regenerate doc.go from re2 syntax
Generated using re2/doc/mksyntaxgo. Fixes #8505. LGTM=iant R=r, iant CC=golang-codereviews https://golang.org/cl/155890043
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Generated using re2/doc/mksyntaxgo. Fixes #8505. LGTM=iant R=r, iant CC=golang-codereviews https://golang.org/cl/155890043