pgsql: Refactor Windows error message for easier translation

Refactor Windows error message for easier translation

In the error messages referring to the user right "Lock pages in
memory", this is a term from the Windows OS, so it should be
translated in accordance with the OS localization.  Refactor the error
messages so this is easier and clearer.  Also fix the capitalization
to match the existing capitalization in the OS.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/3c78e0569ca04f4c92f0adcd74471398bb7b2e55

Modified Files
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doc/src/sgml/config.sgml       |  6 +++---
src/backend/port/win32_shmem.c | 16 ++++++++++------
2 files changed, 13 insertions(+), 9 deletions(-)