MQE-2495: config parallel by number of groups

Author: jilu1

docs/commands/mftf.md

@@ -163,6 +163,7 @@ vendor/bin/mftf generate:tests [option] [<test name>] [<test name>] [--remove]
 | `--filter` | Option to filter tests to be generated.<br/>Template: '&lt;filterName&gt;:&lt;filterValue&gt;'.<br/>Existing filter types: severity.<br/>Existing severity values: BLOCKER, CRITICAL, MAJOR, AVERAGE, MINOR.<br/>Example: --filter=severity:CRITICAL|
 | `--force` | Forces test generation, regardless of the module merge order defined in the Magento instance. Example: `generate:tests --force`. |
 | `-i,--time` | Set time in minutes to determine the group size when `--config=parallel` is used. The __default value__ is `10`. Example: `generate:tests --config=parallel --time=15`|
+| `-g,--groups` | Set number of groups to be split into when `--config=parallel` is used. `--time` and `--groups` options are mutually exclusive. Example: `generate:tests --config=parallel --groups=300`|
 | `--tests` | Defines the test configuration as a JSON string.|
 | `--allow-skipped` | Allows MFTF to generate and run tests marked with `<skip>.`|
 | `--debug` | Performs schema validations on XML files. <br/> DEFAULT: `generate:tests` implicitly performs schema validation on merged files. It does not indicate the file name where the error is encountered. <br/> DEVELOPER: `--debug` performs per-file validation and returns additional debug information (such as the filename where an error occurred) when test generation fails because of an invalid XML schema. This option takes extra processing time. Use it after test generation has failed once.<br/>|