pgsql: Improve documentation about use of Linux huge pages.

Improve documentation about use of Linux huge pages.

Show how to get the system's huge page size, rather than misleadingly
referring to PAGE_SIZE (which is usually understood to be the regular
page size). Show how to confirm whether huge pages have been allocated.
Minor wordsmithing. Back-patch to 9.4 where this section appeared.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/13d5dd50956163cbd3268b1ab118aad801c78274

Modified Files
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doc/src/sgml/runtime.sgml | 62 +++++++++++++++++++++++++++++------------------
1 file changed, 38 insertions(+), 24 deletions(-)

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