Avoid using "host" terminology for example applications that embed runtimes

Example amendments: https://github.com/bytecodealliance/component-docs/pull/334#pullrequestreview-4122906610

Start with the amendments and review discussion at pull request 334, then locate the example-application documentation it references. Update terminology where applications embed runtimes so it no longer uses “host” in that context, and verify the affected examples consistently use the agreed wording.

Escrito por el modelo de indexación a partir del texto del issue.