Fix docs online build (#1637)

Signed-off-by: Wang, Chang <chang1.wang@intel.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: changwangss

docs/api_doc/optimization/config.rst

@@ -4,7 +4,4 @@ Config
 .. autoapisummary::
    intel_extension_for_transformers.transformers.utils.metrics
    intel_extension_for_transformers.transformers.utils.objectives
-   intel_extension_for_transformers.transformers.config
-   intel_extension_for_transformers.transformers.quantization
-   intel_extension_for_transformers.transformers.distillation
-   intel_extension_for_transformers.transformers.pruning
+   intel_extension_for_transformers.transformers.utils.config

docs/api_doc/optimization/tf_optimization.rst

@@ -7,7 +7,5 @@ The following Python API information is available:
    :maxdepth: 1
 
    optimization/trainer.rst
-   optimization/optimizer.rst
    optimization/model.rst
-   optimization/tf_optimization.rst
    optimization/config.rst