Remove all xsd versions from the reference manual samples in favor of
"versionless" XSDs. For example, spring-beans-3.0.xsd becomes
spring-beans.xsd
Issue: SPR-10010
Convert all docbook XML files to well-formed docbook 5 syntax:
- Include xsi:schemaLocation element for tools support
- Convert all id elements to xml:id
- Convert all ulink elements to link
- Simplify <lineannotation> mark-up
- Fix misplaced </section> tags
- Fix <interface> tags to <interfacename>
- Cleanup trailing whitespace and tabs
Issue: SPR-10032
This change eliminates the spring-framework-reference subproject, moving
these sources into the root project's own src directory.
This makes sense because the reference docs span all submodules, and
also because api Javadoc is created at the root project level as well.
This means that both api and reference documentation output will now
reside in the root project's 'build' directory. This is more consistent
and easy to discover.