docs: (minor) update to anthropic doc (#18794)

**Description:** Minor update to Anthropic documentation
**Issue:** Not applicable
**Dependencies:** None
**Lint and test**: `make format` and `make lint` was done

docs/docs/integrations/chat/anthropic.ipynb

@@ -41,7 +41,7 @@
    "source": [
     "## Environment Setup\n",
     "\n",
-    "We'll need to get a [Anthropic](https://console.anthropic.com/settings/keys) and set the `ANTHROPIC_API_KEY` environment variable:"
+    "We'll need to get an [Anthropic](https://console.anthropic.com/settings/keys) API key and set the `ANTHROPIC_API_KEY` environment variable:"
    ]
   },
   {

docs/docs/integrations/llms/anthropic.ipynb

@@ -43,7 +43,7 @@
    "source": [
     "## Environment Setup\n",
     "\n",
-    "We'll need to get a [Anthropic](https://console.anthropic.com/settings/keys) and set the `ANTHROPIC_API_KEY` environment variable:"
+    "We'll need to get an [Anthropic](https://console.anthropic.com/settings/keys) API key and set the `ANTHROPIC_API_KEY` environment variable:"
    ]
   },
   {