SAST docs: update for diff scan of c/c++

Hua Yanrequested to merge
hyan/583833-update-docs-for-diff-scan-of-c++ into master

What does this MR do and why?

This MR documents a current limitation: glas-cpp’s diff-scan does not detect vulnerabilities that exist only in header files, as changes in header files are not analyzed independently.

References

gitlab-advanced-sast-cpp: update docs for diff ... (#583833) • Hua Yan • 18.8

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