Add installing entab to pgindent instructions

And minor other pgindent documentation tweaks.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/621eb156f159d4979193939902f49ea597972a7d

Modified Files
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src/tools/pgindent/README |   24 +++++++++++++++---------
1 files changed, 15 insertions(+), 9 deletions(-)

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