Add note about diskspace usage of pg_commit_ts

Simon Riggs <simon@2ndQuadrant.com>

Commit: abe85ef1d00187a42e7a757ea0413bc4965a4525
Author: Simon Riggs <simon@2ndQuadrant.com>
Date: 2017-09-01T06:57:05Z
Releases: 11.0
Add note about diskspace usage of pg_commit_ts

Author: Thomas Munro

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PathChange+/−
doc/src/sgml/maintenance.sgml modified +17 −13

Documentation touched