regenerated all-api-versions

specification/changeanalysis/resource-manager/readme.md

@@ -113,3 +113,28 @@ directive:
         }
       }
 ```
+
+## Multi-API/Profile support for AutoRest v3 generators 
+
+AutoRest V3 generators require the use of `--tag=all-api-versions` to select api files.
+
+This block is updated by an automatic script. Edits may be lost!
+
+``` yaml $(tag) == 'all-api-versions' /* autogenerated */
+# include the azure profile definitions from the standard location
+require: $(this-folder)/../../../profiles/readme.md
+
+# all the input files across all versions
+input-file:
+  - $(this-folder)/Microsoft.ChangeAnalysis/preview/2020-04-01-preview/changeanalysis.json
+
+```
+
+If there are files that should not be in the `all-api-versions` set, 
+uncomment the  `exclude-file` section below and add the file paths.
+
+``` yaml $(tag) == 'all-api-versions'
+#exclude-file: 
+#  - $(this-folder)/Microsoft.Example/stable/2010-01-01/somefile.json
+```
+