Fix endpoint description

Author: GavinMendelGleason

README.md

@@ -45,7 +45,8 @@ If you wan to index documents, you can any of these methods:
 
 * Run a TerminusDB installation and refer to real commits and databases
 * Put up an endpoint that will issue the appropriate operations for a
-commit id and a domain with the endpoint `ENDPOINT/domain?commit_id=COMMIT`
+  commit id and a domain with the endpoint
+  `TERMINUSDB_CONTENT_ENDPOINT/{domain}?commit_id={commit}`
 * use the `load` command with a file
 
 In any of these cases, the indexer expects a content stream which will