doc: Consistently use double quotes for attrs in ulinks

The href attribute to the ulink is rendered with double quotes in
the <a> tag, and we use double quotes in the XML markup as well.
This fixes the two cases which used single quotes.

Author: Anatoliy Kraev <[email protected]>
Discussion: https://postgr.es/m/[email protected]

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/8e82d6610e7280d7870c0c36ff1c797e3cfb3e09

Modified Files
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doc/src/sgml/features.sgml | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

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