doc: Make synopsis placeholders consistent

Existing text (e.g., create_foreign_table.sgml) uses server_name, not
servername.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/0e9a31be88b8c05f558447a3d459ad54abe13e36

Modified Files
--------------
doc/src/sgml/ref/alter_subscription.sgml  | 6 +++---
doc/src/sgml/ref/create_subscription.sgml | 6 +++---
2 files changed, 6 insertions(+), 6 deletions(-)

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