Improve error message of collocated fragments.

src/rule-must-colocate-fragment-spreads.js

@@ -155,10 +155,12 @@ function checkColocation(context) {
               loc: utils.getLoc(context, node, queriedFragments[fragment]),
               message:
                 `This spreads the fragment \`${fragment}\` but ` +
-                'this module does not use it directly. If a different module ' +
-                'needs this information, that module should directly define a ' +
-                'fragment querying for that data, colocated next to where the ' +
-                'data is used.\n'
+                `this module does not use it directly or it the fragment is named incorrectly. If a different module ` +
+                `needs the data from this fragment, that module should directly define it's own fragment ` +
+                `to query for it's own data, and such fragment should be spread in the parent component.` +
+                `The naming convention should be <nameOfComponentCamelCase>_<optionalSuffix>. ` +
+                `The <nameOfComponentCamelCase> should match the import name. Optinal suffix should be separated ` +
+                `by underscore (usually when you need to pass multiple fragments to the same component).\n`
             });
           }
         }