pgsql: Fix two recently introduced grammar errors in mmgr/README.

Fix two recently introduced grammar errors in mmgr/README.

These were introduced by me in f4e2d50c.

Reported-By: Tomas Vondra
Discussion: /messages/by-id/11adca69-be28-44bc-a801-64e6d53851e3@2ndquadrant.com

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/1309375e706440e1e2fe2a5bb74effbc639261ef

Modified Files
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src/backend/utils/mmgr/README | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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