The Tag reference and Inline tag reference tables of content on docs.phpdoc.org rendered <Unknown> entries for six .rst files whose only body was a .. include:: <other>.rst line (see #3759). Without a top-level title, the toctree could not extract a label for them.

Replace each include with a proper RST title matching the tag name plus a short cross-reference and a one-liner that spells out the variant's specific semantics. Users landing on each URL still get a clear pointer to the canonical reference page.

Affected files:

• docs/references/phpdoc/tags/property-read.rst (@property-read)
• docs/references/phpdoc/tags/property-write.rst (@property-write)
• docs/references/phpdoc/inline-tags/example.rst (@example)
• docs/references/phpdoc/inline-tags/internal.rst (@internal)
• docs/references/phpdoc/inline-tags/link.rst (@link)
• docs/references/phpdoc/inline-tags/see.rst (@see)

Inline-tag titles follow the existing inheritdoc.rst convention (bare @tag, no braces) so the inline-tags toctree stays visually uniform.

Fixes #3759