pgsql: Minor cleanups in slot related code.

Minor cleanups in slot related code.

Fix a bunch of typos, and remove two superflous includes.

Author: Gurjeet Singh
Discussion: CABwTF4Wh_dBCzTU=49pFXR6coR4NW1ynb+vBqT+Po=7fuq5iCw@mail.gmail.com
Backpatch: 9.4

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/58d2e7fb70584598e026a39f515c5f3c5e589857

Modified Files
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src/backend/replication/logical/logical.c | 3 ---
src/backend/replication/slot.c | 4 ++--
2 files changed, 2 insertions(+), 5 deletions(-)

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