doc: Improve calculation of vm.nr_hugepages

The previous method worked off the full virtual address space, not just
the shared memory usage.

Author: Tsunakawa, Takayuki <tsunakawa.ta...@jp.fujitsu.com>
Reviewed-by: Justin Pryzby <pry...@telsasoft.com>
Reviewed-by: Vasundhar Boddapati <bvasund...@gmail.com>

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/a3739e376fbc9d6e332ce33d42426b1d8b59f20b

Modified Files
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doc/src/sgml/runtime.sgml | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

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