Update Grammar.md (#5820)
Update Grammar.md (#5820)

* Update Grammar.md

Some consistency fixes to the grammar file

* Some more minor fixes to Grammar.md

* Update Grammar.md
evolutional/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,evolutional/flatbuffers,google/flatbuffers,evolutional/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,google/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,pjulien/flatbuffers,google/flatbuffers,google/flatbuffers,google/flatbuffers,google/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,google/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,google/flatbuffers,alexames/flatbuffers,google/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,google/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,pjulien/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,google/flatbuffers,pjulien/flatbuffers,google/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,pjulien/flatbuffers