Fix two error messages in extended_stats_funcs.c

Michael Paquier <michael@paquier.xyz>

Commit: 740a1494f4bfb470b16e5b70c79fae473b1a655d
Author: Michael Paquier <michael@paquier.xyz>
Date: 2026-01-29T05:57:47Z
Fix two error messages in extended_stats_funcs.c

These have been fat-fingered in 0e80f3f88dea and 302879bd68d1.  The
error message for ndistinct had an incorrect grammar, while the one for
dependencies had finished with a period (incorrect based on the project
guidelines).

Discussion: https://postgr.es/m/aXrsjZQbVuB6236u@paquier.xyz

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