docs: updated wrong output in `Upstash Redis Cache` section of LLM Ca… (#15140)

…ching documentation

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- **Description:** Fixed the wrong output and code block comment in
`Upstash Redis` Cache section of LLM Caching documentation,
  - **Issue:** #15139 ,
  - **Dependencies:** N/A,
- **Twitter handle:** [@vardhaman722](https://twitter.com/vardhaman722)

docs/docs/integrations/llms/llm_caching.ipynb

@@ -287,7 +287,7 @@
     {
      "data": {
       "text/plain": [
-       "'\\n\\nTwo guys stole a calendar. They got six months each.'"
+       "'\\n\\nWhy did the chicken cross the road?\\n\\nTo get to the other side!'"
       ]
      },
      "execution_count": 50,
@@ -297,7 +297,7 @@
    ],
    "source": [
     "%%time\n",
-    "# The first time, it is not yet in cache, so it should take longer\n",
+    "# The second time it is, so it goes faster\n",
     "llm(\"Tell me a joke\")"
    ]
   },