build2 integration doc update (#4587)

* build2 integration doc update

Signed-off-by: Joël Lamotte <mjklaim@gmail.com>
Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* completed build2 instructions and examples

Signed-off-by: Joël Lamotte <mjklaim@gmail.com>
Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* added missing build2 buildfile

Signed-off-by: Joël Lamotte <mjklaim@gmail.com>
Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* improvments/simplifications on build2 examples

Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* removed just (rebase issue)

Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* fixed removed trailing whitespace from the rebase

Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* fixed typo and improved wording

Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

* fixed indentation/formatting and typos

Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>

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Signed-off-by: Joël Lamotte <mjklaim@gmail.com>
Signed-off-by: Klaim (Joël Lamotte) <142265+Klaim@users.noreply.github.com>