TINYDOC-3432 - Document Vue 3 prop-driven content updates in the Vue technical reference

[kemister85]

Ticket: TINYDOC-3432

Site: https://pr-4282.tinymce-docs.iad.staging.tiny.cloud/docs/tinymce/latest/vue-ref/#updating-the-editor-content-from-a-parent-component

Changes:

Extends the v-model section of the Vue.js technical reference (modules/ROOT/partials/integrations/vue-tech-ref.adoc, included by vue-ref.adoc) to answer a recurring Kapa question: how the @tinymce/tinymce-vue editor updates when a parent component changes the bound content prop after mount.

This brings the Vue reference to parity with the React, Angular, and Svelte references, which already document how each wrapper reacts to parent-driven content updates.

Added a new "Updating the editor content from a parent component" subsection (plus a TOC entry) documenting, verified against @tinymce/tinymce-vue v6.3.1 source:

• The component watches the v-model/modelValue value and calls editor.setContent() when a parent reassigns it.
• The guard conditions that prevent a redundant setContent() and cursor reset during the normal edit → update:modelValue round trip (value is a string, differs from the previous value, and differs from the current editor content compared using output-format).
• A v-model code example showing a parent reassigning the bound value.
• A single sentence noting that without v-model the watcher is inactive, cross-referencing the existing Event binding section for obtaining the editor instance (rather than duplicating that guidance or promoting a binding bypass).

[kemister85]

@tiny-ben-tran If you can review for next week