[ADD] AI: Write or improve text with AI

closes odoo/documentation#16288

Signed-off-by: Felicia Kuan (feku) <feku@odoo.com>

content/applications/productivity/ai.rst

@@ -93,3 +93,4 @@ Below are some common requests that the *Ask AI* agent can assist with:
    ai/server-actions
    ai/email-templates
    ai/voice
+   ai/improve_text

content/applications/productivity/ai/improve_text.rst

@@ -0,0 +1,74 @@
+==============================
+Write and improve text with AI
+==============================
+
+.. |AI| replace:: :abbr:`AI (artificial intelligence)`
+
+Odoo |AI| can assist with writing and refining text across the database. This makes it easier to
+draft emails, improve existing content, and quickly extract key information from discussions or
+notes.
+
+|AI| writing features are available in most rich-text environments in Odoo, including:
+
+- *Description* and *Notes* fields on records
+- Email composers and email templates
+- **Knowledge** articles
+
+These features are accessible through the text editor and the :ref:`powerbox
+<essentials/html_editor/commands>`, depending on the context.
+
+.. image:: improve_text/knowledge-article.png
+   :alt: A knowledge article with the AI improve text option visible.
+
+Writing with AI
+===============
+
+|AI| can generate new text based on a short prompt or partial input. This is useful for drafting
+content such as emails, task descriptions, or internal notes.
+
+To generate text, either click the |AI| icon, or type `/` to open the powerbox, and select
+:guilabel:`AI` from the drop-down menu. Both options open a conversation window. Enter a short
+prompt describing the desired content, then click the :icon:`fa-paper-plane-o` :guilabel:`(paper
+plane)` icon. After the text is generated, hover over the response and click :guilabel:`Use this` to
+add the content to the desired field or document. Alternatively, click the :icon:`fa-copy`
+:guilabel:`(copy)` icon to copy the text to the clipboard.
+
+.. image:: improve_text/conversation-window.png
+   :alt: A conversation window with an AI agent generating content.
+
+If unsatisfied with the content, send a follow-up message to the agent with an expanded prompt or
+suggested changes.
+
+Improving existing text
+=======================
+
+|AI| can also be used to rewrite or improve existing text. This includes:
+
+- Making text clearer or more concise
+- Adjusting tone or structure
+- Correcting grammar or phrasing
+
+Select the text to improve, then click the |AI| icon to open a conversation window. Click the
+:guilabel:`Rewrite selected` prompt. After the text is generated, hover over the response and click
+:guilabel:`Use this` to add the content to the desired field or document. Alternatively, click the
+:icon:`fa-copy` :guilabel:`(copy)` icon to copy the text to the clipboard.
+
+.. image:: improve_text/rewrite-prompt.png
+   :alt: The rewrite selected text in a conversation window.
+
+.. tip::
+   To add custom instructions to the prompt, such as suggestions on tone or content, write the
+   prompt directly in the conversation window. For example, `Rewrite the selected text in a more
+   professional tone`.
+
+Best practices for AI-assisted writing
+======================================
+
+For best results when using |AI| to write or improve text:
+
+- Provide clear and specific context in prompts
+- Review AI-generated content before saving or sending
+- Adjust wording to match the company's tone and communication standards
+
+|AI|-assisted writing is designed to support productivity, while final review and validation remain
+essential.