Update submission and api docs.

Author: fkdosilovic

docs/source/api/api.rst

@@ -3,4 +3,4 @@ API Module
 
 .. automodule:: judge0.api
    :members:
-   :undoc-members:
+   :exclude-members: sync_run, async_run

docs/source/api/submission.rst

@@ -3,4 +3,6 @@ Submission Module
 
 .. automodule:: judge0.submission
    :members:
+   :exclude-members: process_encoded_fields, process_language, process_post_execution_filesystem,
+                     process_status
    :member-order: groupwise

src/judge0/api.py

@@ -188,6 +188,11 @@ def wait(
     retry_strategy : RetryStrategy, optional
         A retry strategy.
 
+    Returns
+    -------
+    Submission or Submissions
+        A single submission or a list of submissions.
+
     Raises
     ------
     ClientResolutionError

src/judge0/submission.py

@@ -208,7 +208,7 @@ def process_language(
             return value
 
     def set_attributes(self, attributes: dict[str, Any]) -> None:
-        """Set Submissions attributes while taking into account different
+        """Set submissions attributes while taking into account different
         attribute's types.
 
         Parameters
@@ -236,7 +236,7 @@ def set_attributes(self, attributes: dict[str, Any]) -> None:
 
     def as_body(self, client: "Client") -> dict:
         """Prepare Submission as a dictionary while taking into account
-        the `client`'s restrictions.
+        the client's restrictions.
         """
         body = {
             "source_code": encode(self.source_code),