fix: Remove execution metadata from markdown cells in notebook

GitHub Copilot correctly identified that markdown cells should not have
execution metadata. This metadata is an artifact from running the notebook
and can cause issues with notebook validation or rendering in some tools.

Cleaned 9 markdown cells by removing their 'execution' metadata blocks.
Only code cells should have execution metadata.

Author: nkanu17

docs/user_guide/11_advanced_queries.ipynb

@@ -720,14 +720,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.811787Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.811690Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.815321Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.814731Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Basic Aggregate Hybrid Query\n",
     "\n",
@@ -758,14 +751,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.816616Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.816532Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.821881Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.821391Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Adjusting the Alpha Parameter\n",
     "\n",
@@ -799,14 +785,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.823541Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.823439Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.828312Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.827926Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Aggregate Hybrid Query with Filters\n",
     "\n",
@@ -836,14 +815,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.829575Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.829504Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.834732Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.833874Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Using Different Text Scorers\n",
     "\n",
@@ -873,14 +845,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.837731Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.837600Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.840903Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.840434Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "## 3. MultiVectorQuery: Multi-Vector Search\n",
     "\n",
@@ -938,14 +903,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.842349Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.842258Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.847243Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.846864Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Adjusting Vector Weights\n",
     "\n",
@@ -986,14 +944,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.848644Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.848494Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.853447Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.852939Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "### Multi-Vector Query with Filters\n",
     "\n",
@@ -1034,14 +985,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.854587Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.854519Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.859269Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.858887Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "## Comparing Query Types\n",
     "\n",
@@ -1135,14 +1079,7 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {
-    "execution": {
-     "iopub.execute_input": "2025-11-21T00:42:13.870483Z",
-     "iopub.status.busy": "2025-11-21T00:42:13.870410Z",
-     "iopub.status.idle": "2025-11-21T00:42:13.873440Z",
-     "shell.execute_reply": "2025-11-21T00:42:13.873012Z"
-    }
-   },
+   "metadata": {},
    "source": [
     "## Best Practices\n",
     "\n",