[PATCH] Fix typo in pgstat_replslot.c

[zengman]

Hi,

I noticed this could be corrected to `exists` (instead of `exits`) here, same 
as commit 63ed3bc7f9a66035e0b741aaa542de35a90fe1cc.
```c
        /* Check if the slot exits with the given name. */
        slot = SearchNamedReplicationSlot(name, false);

        if (!slot)
                ereport(ERROR,
                                (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
                                 errmsg("replication slot \"%s\" does not 
exist",
                                                name)));
```

--
Regards,
Man Zeng
www.openhalo.org

0001-This-should-be-exists-here-instead-of-exits-consiste.patch
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