docs: Fix remaining 'Bank America' reference to 'Bank Berlin'

Updated the explanation text to use 'Bank Berlin' instead of 'Bank America'
for consistency. The phrase now correctly shows that 'Bank of Berlin' would
be indexed as 'Bank Berlin' (without 'of') when using default stopwords.

Author: nkanu17

docs/user_guide/11_advanced_queries.ipynb

@@ -635,7 +635,7 @@
     "If we had used the default stopwords (not specifying `stopwords` in the schema), the word \"of\" would be filtered out during indexing. This means:\n",
     "\n",
     "- ❌ Searching for `\"Bank of Berlin\"` might not find exact matches\n",
-    "- ❌ The phrase would be indexed as `\"Bank America\"` (without \"of\")\n",
+    "- ❌ The phrase would be indexed as `\"Bank Berlin\"` (without \"of\")\n",
     "- ✅ With `STOPWORDS 0`, all words including \"of\" are indexed\n",
     "\n",
     "**Custom Stopwords Example:**\n",