Updated README for multi tool

.doc_gen/readmes/README.md

@@ -119,15 +119,15 @@ python .doc_gen/readmes/multi.py --language <language1>:<version> <language2>:<v
 For example, to generate S3 and STS READMEs for Python sdk version 3 and Go sdk version 2:
 
 ```
-python .doc_gen/readmes/writeme.py --languages Python:3 Go:2 --services s3 sts
+python .doc_gen/readmes/multi.py --languages Python:3 Go:2 --services s3 sts
 ```
 
-This creates the README.md files in `python/example_code/s3` and other folders folder.
+This creates the README.md files in `python/example_code/s3` and other folders.
 
 To build all READMEs for Rust:
 
 ```
-$ python .doc_gen/readmes/writeme.py --languages Rust:1
+$ python .doc_gen/readmes/multi.py --languages Rust:1
 INFO:root:Dry run, no changes will be made.
 DEBUG:root:Rendering Rust:1:acm
 DEBUG:root:Rendering Rust:1:api-gateway
@@ -137,7 +137,15 @@ DEBUG:root:Rendering Rust:1:transcribe-medical
 DEBUG:root:Rendering Rust:1:translate
 ```
 
-> Note that at this time, there is no way to specify a `svc_folder` override for the SDKs! This is the main reason this tool is still experimental.
+To specify `svc_folder` overrides, add a dict to the language in `config.py` with
+the name `service_folder_overrides` and entries with the service name as the key
+and complete folder override as the value. See dotnetv3 for an example.
+
+And yes, building all readmes for all languages after changing metadta or templates is now as easy as
+
+```
+python .doc_gen/readmes/multi.py
+```
 
 ### Parameters