Merge pull request #174 from krancour/design-doc-rewrite

doc(design-doc): update design doc docs

Author: krancour

docs/src/contributing/design-documents.md

@@ -1,6 +1,6 @@
 # Design Documents
 
-Before submitting a pull request which will change the behavior of Deis significantly, such as a new feature or major refactoring, contributors should first open an issue representing a design document.
+Before submitting a pull request which will significantly alter the behavior of any Deis component, such as a new feature or major refactoring, contributors should first open an issue representing a design document.
 
 ## Goals