updated cheatsheet (#10273)

* updated cheatsheet

* better changelog

* one more update

Author: Zim Kalinowski

doc/dev/mgmt/cheatsheet.md

@@ -20,15 +20,21 @@ For all packages:<br/>
 `python ./scripts/dev_setup.py`
 
 For a specific package:<br/>
-`python ./scripts/dev_setup.py -p azure-mgmt-servicename`
+
+```shell
+export PACKAGE=azure-mgmt-servicename
+python ./scripts/dev_setup.py -p $PACKAGE
+```
 
 ## Generate tags for multi-api Swagger Readme
 
 `python ./scripts/multi_api_readme_help.py /azure-rest-api-specs/specification/service/resource-manager/`
 
 ## Generate a package
 
-`python -m packaging_tools.generate_sdk -v -m restapi_path/readme.md`
+```shell
+python -m packaging_tools.generate_sdk -v -m restapi_path/readme.md
+```
 
 Regenerate multi-api client:<br/>
 `python ./scripts/multiapi_init_gen.py azure-mgmt-myservice`
@@ -60,11 +66,16 @@ Available options:
 
 ## ChangeLog
 
-Generate code report for last version on PyPI:<br/>`python -m packaging_tools.code_report --last-pypi azure-mgmt-myservice`
-
-Generate code report for version installed in current venv:<br/>`python -m packaging_tools.code_report azure-mgmt-myservice`
+Changelog is generated by performing following steps: 
+- generate code report for last version on PyPI:
+- generate code report for version installed in current venv
+- generate a markdown changelog
 
-Generate a markdown changelog:<br/>`python -m packaging_tools.change_log ./old_version_report.json ./new_version_report.json`
+```shell
+python -m packaging_tools.code_report --last-pypi $PACKAGE --output=$HOME/old.json
+python -m packaging_tools.code_report $PACKAGE --output=$HOME/new.json
+python -m packaging_tools.change_log $HOME/old.json $HOME/new.json
+```
 
 ## Tests