docs(Statcast): Add runner_extra_bases_taken function documentation

Author: ss77995ss

docs/runner_extra_bases_taken.md

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+# Statcast Runner Extra Bases Taken
+
+## `runner_extra_bases_taken`
+
+Function to get extra base taken data from each advanced opportunity for a specific runner. Based on Baseball Savant's [Runner Extra Bases Taken](https://baseballsavant.mlb.com/leaderboard/baserunning).
+
+**Examples**
+
+```python
+from baseball_stats_python import runner_extra_bases_taken
+
+# Get Corbin Carroll's runner extra bases taken data
+runner_extra_bases_taken('682998')
+
+# Get Corbin Carroll's runner extra bases taken data in 2023
+runner_extra_bases_taken('682998', season='2023')
+
+# Get Corbin Carroll's runner extra bases taken data in playoffs
+runner_extra_bases_taken('682998', game_type=GameType.PLAYOFFS)
+```
+
+**Arguments**
+
+| Argument             | Data Type           | Description                                                                                                                                                   |
+| -------------------- | ------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| runner_id (Required) | `str`               | The MLBAM ID of the runner.                                                                                                                                   |
+| game_type            | `str` or `GameType` | The game type to filter by. Can be `R` for regular season, `PO` for playoffs, or `All` for all games. Check enum [GameType](../enums/statcast_leaderboard.py) |
+| season               | `str`               | The season to filter by. The earliest season available is 2016.                                                                                               |
+
+**Return**
+
+A DataFrame with columns that related to the [Runner Extra Bases Taken](https://baseballsavant.mlb.com/leaderboard/baserunning) leaderboard. The DataFrame will represent each advanced opportunity for a specific runner which contains data like `fielder_runs`, `runner_runs`, `base_out_text`, etc.