Update installation.md

docs/installation.md

 * TensorFlow (1.0+) (Training)
 
 ### Installing Dependencies
-To install dependencies, go into the `python` sub-directory of the repositroy, and run (depending on your python version) from the command line:
+To install dependencies, go into the `python` sub-directory of the repository, and run (depending on your python version) from the command line:
 
 `pip install .`