Fixed typos.

Author: jlesage

README.md

@@ -115,11 +115,11 @@ container cannot be changed, but you are free to use any port on the host side.
 
 ### Changing Parameters of a Running Container
 
-As seen, environment variables, volume mappings and port mappings are specified
+As can be seen, environment variables, volume and port mappings are all specified
 while creating the container.
 
 The following steps describe the method used to add, remove or update
-parameter(s) of an existing container.  The generic idea is to destroy and
+parameter(s) of an existing container.  The general idea is to destroy and
 re-create the container:
 
   1. Stop the container (if it is running):
@@ -241,7 +241,7 @@ http://<HOST IP ADDR>:8181
 
 ## Shell Access
 
-To get shell access to a the running container, execute the following command:
+To get shell access to the running container, execute the following command:
 
 ```
 docker exec -ti CONTAINER sh