Review and update Configure C/C++ debugging topic

[gregvanl]

https://code.visualstudio.com/docs/cpp/launch-json-reference

The topic has high page views (>50 K in July, ranked #22) and low CSAT (40% for last 6 months) and pulls down the overall CSAT for code.visualstudio.com/docs by 0.5%.
To meet the FY23 OKR of overall doc CSAT of 78%, this topic is a good target for improvement with significant impact.
The topic has a high percentage of direct traffic (35%) due to a link in the C++ extension.