Update leaguedashteamstats.md

NBA changed options to Guard, Forward and Center. Updating issue  swar#489

Author: bendemouth

docs/nba_api/stats/endpoints/leaguedashteamstats.md

@@ -28,7 +28,7 @@
 | [_**StarterBench**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#StarterBench)         | starter_bench_nullable                |                                                           `((Starters)\|(Bench))?`                                                            |          |   `Y`    | 
 | [_**ShotClockRange**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#ShotClockRange)     | shot_clock_range_nullable             |                 `((24-22)\|(22-18 Very Early)\|(18-15 Early)\|(15-7 Average)\|(7-4 Late)\|(4-0 Very Late)\|(ShotClock Off))?`                 |          |   `Y`    | 
 | [_**SeasonSegment**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#SeasonSegment)       | season_segment_nullable               |                                                    `^((Post All-Star)\|(Pre All-Star))?$`                                                     |   `Y`    |   `Y`    | 
-| [_**PlayerPosition**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#PlayerPosition)     | player_position_abbreviation_nullable |                                                `((F)\|(C)\|(G)\|(C-F)\|(F-C)\|(F-G)\|(G-F))?`                                                 |          |   `Y`    | 
+| [_**PlayerPosition**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#PlayerPosition)     | player_position_abbreviation_nullable |                                                `((F)\|(C)\|(G)\)?`                                                 |          |   `Y`    | 
 | [_**PlayerExperience**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#PlayerExperience) | player_experience_nullable            |                                                     `((Rookie)\|(Sophomore)\|(Veteran))?`                                                     |          |   `Y`    | 
 | [_**PORound**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#PORound)                   | po_round_nullable                     |                                                                                                                                               |          |   `Y`    | 
 | [_**Outcome**_](https://github.com/swar/nba_api/blob/master/docs/nba_api/stats/library/parameters.md#Outcome)                   | outcome_nullable                      |                                                                `^((W)\|(L))?$`                                                                |   `Y`    |   `Y`    | 
@@ -223,4 +223,4 @@
 }
 ```
 
-Last validated 2020-08-16
+Last validated 2020-08-16