gitlab-advanced-sast-cpp: include all the detected CWEs in docs

Problem

Potential customers concern that we don’t find as many CWEs in C++

Proposal

Following PM suggestions, we should include all the CWEs detected by glas-cpp in our docs.

Implementation plan

• collect all CWE id's in mappings.yaml
• update the docs to include those CWE id's for C/C++