Reword text on ROW SHARE lock as acquired by SELECT FOR <lock>

It was missing lock levels FOR KEY SHARE and FOR NO KEY EXCLUSIVE; but
also SELECT FOR UPDATE is not a command separate from SELECT, as the
original text implied.  It is clearer to state that FOR <lock strength>
is an option of regular SELECT.

Per suggestion from Joey Bodoia <[email protected]>

Reviewed-by: Joey Bodoia <[email protected]> (offlist)
Reviewed-by: Erikjan Rijkers <[email protected]>
Discussion: 
https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/275e719d910459db747346a51d56185e2440763b

Modified Files
--------------
doc/src/sgml/mvcc.sgml | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)

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