Docs: Fix broken link to version policy

[chrisrueger]

Closes #6372

In this PR:

• fixed a broken link
• added new links to existing pages where I thought it would improve understanding (by inter-connecting already existing related pages)
• added more examples for versionmask and range macro

Relevant pages:

• https://bnd.bndtools.org/chapters/170-versioning.html
• https://bnd.bndtools.org/macros/version.html
• https://bnd.bndtools.org/macros/versionmask.html
• https://bnd.bndtools.org/macros/range.html
• https://bnd.bndtools.org/instructions/consumer_policy.html
• https://bnd.bndtools.org/instructions/provider_policy.html

[chrisrueger]

@pkriens FYI