Update 3-docker.md

docs/3-docker.md

@@ -14,7 +14,7 @@ docker-compose up --build
 
 ```Error: Invalid module name entered```
 
-This just means that the pepsirf command was not given arguments. You can ignore since you will be providing arguments when running the image.
+This just means that the pepsirf command was not given arguments. You can ignore this since you will be providing arguments when running the image.
 
 ### Running the PepSIRF image
 
@@ -27,4 +27,4 @@ pepsirf [ --help | module_name <module_args*> ]
 - Replace <path/to/local/directory> with the actual path to your local directory.
 - Replace <new_directory> with the desired name for the directory in the container.
 - If you are specifying a file (for reading or writing) from the source directory, use /app/<new_directory/file>
-- Make sure that Docker is granted permission for file sharing with the local directory.
+- Make sure that Docker is granted permission for file sharing with the local directory.