Fix duplicated word in lsyscache.c comment

Chao Li <li.evan.chao@gmail.com>

From: Chao Li <li.evan.chao@gmail.com>
To: Postgres hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-12-30T00:00:25Z
Lists: pgsql-hackers

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Hi Hackers,

While working on a couple of patches that touched lsyscache.c, I noticed a
small typo in a comment:

```
 * This is trivially true if they are the same operator. Otherwise,   <====
duplicate “Otherwise"
* Otherwise, we look to see if they both belong to an opfamily that
```

So I’m posting a trivial patch to fix it.

Best regards,
--
Chao Li (Evan)
HighGo Software Co., Ltd.
https://www.highgo.com/