docs: Add input field descriptions to commands

- Include `input: required` in the YAML of various commands
- Clarify the necessity of user input in workflow executions
- Ensure workflow documentation is comprehensive and clear

comments/command.yml

@@ -1,3 +1,4 @@
 description: Automatically add doc comments. Select some code and execute this command to generate comments.
+input: required
 steps:
   - run: $devchat_python $command_path/main.py

docstring/command.yml

@@ -1,3 +1,4 @@
 description: Automatically add docstrings. Select a function or method and execute this command to generate docstring.
+input: required
 steps:
   - run: $devchat_python $command_path/main.py

explain/command.yml

@@ -1,3 +1,4 @@
 description: Explain selected code.
+input: required
 steps:
   - run: $devchat_python $command_path/explain.py

fix/command.yml

@@ -1,3 +1,4 @@
 description: Try to find out potential bugs in the selected code and try fixing these bugs automaticly.
+input: required
 steps:
   - run: $devchat_python $command_path/main.py

unit_tests/command.yml

@@ -1,3 +1,4 @@
 description: Generate unit tests.
+input: required
 steps:
   - run: $devchat_python $command_path/main.py "$input"