Add some documentation about generating the doxygen documentation

[vivien-apple]

Problem

People have hard time finding how to generate the documentation.

Summary of Changes

• Add some documentation in building about generating the documentation.

fixes #1486

[woody-apple]

@vivien-apple restyle :)

[vivien-apple]

I think the restyle job failed in some ways:
stdoutCloning repository
stderrFrom https://github.com/project-chip/connectedhomeip
stderr * [new ref] refs/pull/1496/head -> pull-1496
stderrSwitched to branch 'pull-1496'
stdoutNo existing Restyled PR
stderrSwitched to a new branch 'restyled/pull-1496'
stdoutRestyling #1496
stdoutRestyling ["docs/BUILDING.md"] via "prettier-markdown"
stderrWARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
stdoutdocs/BUILDING.md 247ms
stdout[restyled/pull-1496 3b4b689] Restyled by prettier-markdown
stdout 1 file changed, 3 insertions(+), 2 deletions(-)
stderrTo https://github.com/project-chip/connectedhomeip.git
stdoutSetting status of error for 9402bb0
stderr ! [remote rejected] restyled/pull-1496 -> restyled/pull-1496 (refusing to allow a GitHub App to create or update workflow .github/workflows/build.yaml without workflows permission)
stderrerror: failed to push some refs to 'https://@github.com/project-chip/connectedhomeip.git'
stderrWe had trouble running a system command:
stderr
stderr callProcess: git "push" "--force-with-lease" "origin" "restyled/pull-1496" (exit
stderr 1): failed

[woody-apple]

I think the restyle job failed in some ways:
stdoutCloning repository
stderrFrom https://github.com/project-chip/connectedhomeip
stderr * [new ref] refs/pull/1496/head -> pull-1496
stderrSwitched to branch 'pull-1496'
stdoutNo existing Restyled PR
stderrSwitched to a new branch 'restyled/pull-1496'
stdoutRestyling #1496
stdoutRestyling ["docs/BUILDING.md"] via "prettier-markdown"
stderrWARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
stdoutdocs/BUILDING.md 247ms
stdout[restyled/pull-1496 3b4b689] Restyled by prettier-markdown
stdout 1 file changed, 3 insertions(+), 2 deletions(-)
stderrTo https://github.com/project-chip/connectedhomeip.git
stdoutSetting status of error for 9402bb0
stderr ! [remote rejected] restyled/pull-1496 -> restyled/pull-1496 (refusing to allow a GitHub App to create or update workflow .github/workflows/build.yaml without workflows permission)
stderrerror: failed to push some refs to 'https://@github.com/project-chip/connectedhomeip.git'
stderrWe had trouble running a system command:
stderr
stderr callProcess: git "push" "--force-with-lease" "origin" "restyled/pull-1496" (exit
stderr 1): failed

Ugh, I'll take a look, thanks

[vivien-apple]

Is there a command to just relaunch this job ?

[woody-apple]

Is there a command to just relaunch this job ?

I think I need to fix ignore lists for restyled, I'll work on that this afternoon, sorry :(