Fix grammar in tini section of README.md (#442)

README.md

@@ -372,12 +372,9 @@ assignment is not guaranteed if you change the current set of deployed apps. In
 other words, when you deploy a new app, the port assignments may change.
 
 
-## Zombies reaping
+## Zombie reaping
 
-When running within isolated containers, you may have to care about reaping orphan child processes.
-Haproxy typicaly produce orphan processes because of it's two steps reload machanism.
-Marathon-lb is using [tini](https://github.com/krallin/tini) for this purpose.
-When running in a container whitout pid namespace isolation, setting the `TINI_SUBREAPER` environnement variable is recommended.
+When running with isolated containers, you may need to take care of reaping orphaned child processes. HAProxy typically produces orphan processes because of its two-step reload mechanism. Marathon-LB uses [tini](https://github.com/krallin/tini) for this purpose. When running in a container without PID namespace isolation, setting the `TINI_SUBREAPER` environment variable is recommended.
 
 
 ## Contributing