Remove unnecessary user: root from runCmd examples

The default template user doesn't require explicit root for pip install.

Author: beran-t

docs/troubleshooting/pip-install-error.mdx

@@ -31,18 +31,12 @@ Set the `TMPDIR` environment variable to a disk-backed path so pip downloads don
 <CodeGroup>
 ```typescript JavaScript & TypeScript
 const template = Template()
-  .runCmd(
-    'TMPDIR=/var/tmp pip install --no-cache-dir torch sentence-transformers',
-    { user: 'root' }
-  )
+  .runCmd('TMPDIR=/var/tmp pip install --no-cache-dir torch sentence-transformers')
 ```
 ```python Python
 template = (
     Template()
-    .run_cmd(
-        "TMPDIR=/var/tmp pip install --no-cache-dir torch sentence-transformers",
-        user="root",
-    )
+    .run_cmd("TMPDIR=/var/tmp pip install --no-cache-dir torch sentence-transformers")
 )
 ```
 </CodeGroup>
@@ -54,26 +48,14 @@ E2B sandboxes don't have GPUs, so there's no reason to download CUDA dependencie
 <CodeGroup>
 ```typescript JavaScript & TypeScript
 const template = Template()
-  .runCmd(
-    'pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu',
-    { user: 'root' }
-  )
-  .runCmd(
-    'echo "torch" > /tmp/constraints.txt && pip install --no-cache-dir -c /tmp/constraints.txt sentence-transformers',
-    { user: 'root' }
-  )
+  .runCmd('pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu')
+  .runCmd('echo "torch" > /tmp/constraints.txt && pip install --no-cache-dir -c /tmp/constraints.txt sentence-transformers')
 ```
 ```python Python
 template = (
     Template()
-    .run_cmd(
-        "pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu",
-        user="root",
-    )
-    .run_cmd(
-        'echo "torch" > /tmp/constraints.txt && pip install --no-cache-dir -c /tmp/constraints.txt sentence-transformers',
-        user="root",
-    )
+    .run_cmd("pip install --no-cache-dir torch --index-url https://download.pytorch.org/whl/cpu")
+    .run_cmd('echo "torch" > /tmp/constraints.txt && pip install --no-cache-dir -c /tmp/constraints.txt sentence-transformers')
 )
 ```
 </CodeGroup>