Further code and wording tweaks in BRIN

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 1e0b4365c22c9f8a1bc7a5f8339f770c767b402f
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2014-11-10T18:56:08Z
Releases: 9.5.0
Further code and wording tweaks in BRIN

Besides a couple of typo fixes, per David Rowley, Thom Brown, and Amit
Langote, and mentions of BRIN in the general CREATE INDEX page again per
David, this includes silencing MSVC compiler warnings (thanks Microsoft)
and an additional variable initialization per Coverity scanner.

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