Update docs/Learning-Environment-Examples.md

Co-authored-by: andrewcoh <54679309+andrewcoh@users.noreply.github.com>

docs/Learning-Environment-Examples.md

  - BehaviorParameters:
   - Vector Observations : 4 : 2 floats for Position and 2 floats for orientation
   - Variable Length Observations : Between 1 and 20 entities (one for each tile)
-  each with 22 observations, the first 20 are one hot encoding of the value of the,
+  each with 22 observations, the first 20 are one hot encoding of the value of the tile,
   the 21st represents the position of the tile and the 22nd is 1 if the tile was
   visited and zero otherwise.
   - Actions: 3 discrete branched actions corresponding to forward, backward,