Update process-compose.yml in rails stack (#1573)

Corrected it to reflect rails and not django

## Summary
Changed `django` to `rails`

## How was it tested?
No test needed, comment update

Signed-off-by: Dallas Goldswain <[email protected]>

Author: dallasgoldswain

examples/stacks/rails/process-compose.yml

@@ -1,8 +1,8 @@
-# Process compose for starting django
+# Process compose for starting rails
 version: "0.5"
 
 processes:
   rails:
    command: ./blog/bin/rails server -b
    availability:
-    restart: "always"
+    restart: "always"