MQE-1376: [SPIKE] Investigate Self-Documentation for MFTF

- Adding documentation

Author: aljcalandra

docs/commands/mftf.md

@@ -67,6 +67,13 @@ vendor/bin/mftf run:failed
 This command cleans up the previously generated tests; generates and runs the tests listed in `dev/tests/acceptance/tests/_output/failed`.
 For more details about `failed`, refer to [Reporting][].
 
+### Generate documentation for action groups
+```bash
+vendor/bin/mftf generate:docs
+```
+
+This command generates documentation for action groups.
+
 ## Reference
 
 ### `build:project`
@@ -220,6 +227,33 @@ vendor/bin/mftf generate:urn-catalog [--force] [<path to the directory with misc
 vendor/bin/mftf generate:urn-catalog .idea/
 ```
 
+### `generate:docs`
+
+#### Description
+
+Generates documentation that lists all action groups available in the codebase.
+The default path is `<projectRoot>/dev/tests/docs/documentation.md`.
+
+#### Usage
+
+```bash
+vendor/bin/mftf generate:docs [--clean] [--output=/path/to/alternate/dir]
+```
+
+#### Options
+
+| Option        | Description                                                           |
+| ------------- | --------------------------------------------------------------------- |
+| `-c, --clean` | Overwrites previously existing documentation |
+| `-o, --output` | Changes the default output directory to a user specified directory |
+
+#### Example
+
+```bash
+vendor/bin/mftf generate:docs --clean
+```
+
+
 ### `reset`
 
 #### Description