Remove sentence on backward compatibility -- too schema-specific

CONTRIBUTING.md

@@ -54,7 +54,6 @@ The following guidelines can be used for incrementing the version:
 - Different `MINOR` versions are backward compatible.
 - Different `PATCH` versions are completely compatible.
 
-Compatibility typically implies that a client using an updated version of the schema could work with an older version in the deployed database.
 These suggestions need not be followed strictly, and there may be exceptions.
 For instance, some operations which are technically backward-compatible, such as adding a table, should likely trigger a `MAJOR` version increment rather than `MINOR`, as they would constitute an important and significant update, potentially requiring significant changes to client code or APIs.