Dean Rasheed eca624c659 doc: Fix indentation of MERGE synopsis.
The convention in the documentation for other SQL commands is to
indent continuation lines and sub-clauses in the "Synopsis" section by
4 spaces, so do the same for MERGE.

Author: Dean Rasheed <dean.a.rasheed@gmail.com>
Reviewed-by: Nathan Bossart <nathandbossart@gmail.com>
Discussion: https://postgr.es/m/CAEZATCV+9tR9+WM-SCcdBEZ3x7WVxUpADD5jX9WeGX97z4LCGA@mail.gmail.com
Backpatch-through: 15
2025-06-26 09:36:05 +01:00
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