Fix comment in procarray.c.
Commit
fea10a6434 renamed VariableCacheData.nextFullXid to nextXid.
But commit
dc7420c2c9 introduced the comment mentioning nextFullXid.
This commit changes"nextFullXid" to "nextXid" in the comment.
Author: Zhang Mingli
Discussion: https://postgr.es/m/
642BA615-4B28-4B0C-BDF6-
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