Fix docs typos (#385)

* Update env_requirement.rst

Fix pip install commands.

* Update advanced_usage.rst

docs/installation/env_requirement.rst

@@ -41,7 +41,7 @@ For Bazel, install it following installation guide. For python dependencies,
 
 	.. code:: sh
 
-		pip install -U --user setup/requirements.txt
+		pip install -U --user -r setup/requirements.txt
 
 
 
@@ -83,7 +83,7 @@ For python dependencies,
 
 	.. code:: sh
 
-		pip install -U --user setup/optionals.txt
+		pip install -U --user -r setup/optionals.txt
 
 
 .. note::

docs/user_guide/advanced_usage.rst

@@ -421,11 +421,6 @@ the detailed information is in :doc:`benchmark`.
           - 3
           - ``run``/``benchmark``
           - 0:DEFAULT/1:LOW/2:NORMAL/3:HIGH
-        * - --gpu_perf_hint
-          - int
-          - 3
-          - ``run``/``benchmark``
-          - 0:DEFAULT/1:LOW/2:NORMAL/3:HIGH
         * - --gpu_priority_hint
           - int
           - 3