Remove list item period guidance (#50388)

* Remove list period guidance

Removed non-negotiable rule about list item punctuation.

* Update Markdown writing style instructions

Author: gewarren

.github/agents/docseditor.agent.md

@@ -40,7 +40,6 @@ You are performing an edit pass on a Microsoft documentation article. Your MANDA
 2. **AI Disclosure**: If the `ai-usage` frontmatter is missing, add `ai-usage: ai-assisted`.
 3. **Preserve Meaning**: Never change the technical meaning or accuracy of content.
 4. **Markdown Structure**: Maintain existing markdown formatting and structure.
-5. **Mandatory style**: End list items with periods if more than three words - **THIS IS NON-NEGOTIABLE**.
 
 ## MANDATORY TRANSFORMATIONS - Apply These Aggressively
 
@@ -163,7 +162,6 @@ When editing, focus on these areas in order of priority:
 
 **ALWAYS fix punctuation:**
 - Remove colons from headings: ❌ "Next steps:" → ✅ "Next steps"
-- Periods in lists: Use periods for complete sentences over 3 words
 - ❌ "Prerequisites." → ✅ "Prerequisites" (for short list items)
 
 **ALWAYS use proper formatting:**
@@ -205,7 +203,6 @@ When editing, focus on these areas in order of priority:
 - ALWAYS use Oxford comma: "Android, iOS, and Windows"
 - ALWAYS number ordered lists as "1." for all items (not 1., 2., 3.)
 - ALWAYS use ordered lists for sequential procedural steps and ALWAYS use unordered lists for everything else
-- ALWAYS use periods for complete sentences in lists (if more than 3 words)
 - ALWAYS replace "etc." with "for example" or complete the list
 
 ### Spacing and Punctuation

.github/instructions/Markdown.WritingStyle.instructions.md

@@ -41,7 +41,6 @@ ALWAYS:
 - **MANDATORY: Number ordered lists using "1." for every item (NOT 1., 2., 3.) - ALWAYS USE "1."**
 - **REQUIRED: Use bullets for unordered lists - NEVER use numbers for unordered content**
 - **ESSENTIAL: Write complete sentences in lists with proper punctuation**
-- **MUST: End list items with periods if more than three words. The period may be inside style marks like `*` for italic or `**` for bold - THIS IS NON-NEGOTIABLE**
 - Skip end punctuation on titles, headings, and UI elements (3 words or fewer)
 
 ### Spacing and Layout
@@ -80,4 +79,4 @@ Apply these formatting rules:
 ### Contraction Guidelines
 - Use common contractions: "it's," "you're," "that's," "don't"
 - Avoid ambiguous contractions: "there'd," "it'll," "they'd"
-- Never form contractions from noun + verb (avoid "Microsoft's developing")
+- Never form contractions from noun + verb (avoid "Microsoft's developing")