Update docs-writer skill with new resource (#20917)

.gemini/skills/docs-writer/SKILL.md

@@ -45,6 +45,10 @@ Write precisely to ensure your instructions are unambiguous.
   specific verbs.
 - **Examples:** Use meaningful names in examples; avoid placeholders like
   "foo" or "bar."
+- **Quota and limit terminology:** For any content involving resource capacity
+  or using the word "quota" or "limit", strictly adhere to the guidelines in
+  the `quota-limit-style-guide.md` resource file. Generally, Use "quota" for the
+  administrative bucket and "limit" for the numerical ceiling.
 
 ### Formatting and syntax
 Apply consistent formatting to make documentation visually organized and

.gemini/skills/docs-writer/quota-limit-style-guide.md

@@ -0,0 +1,45 @@
+# Style Guide: Quota vs. Limit
+
+This guide defines the usage of "quota," "limit," and related terms in user-facing interfaces.
+
+## TL;DR
+
+- **`quota`**: The administrative "bucket." Use for settings, billing, and requesting increases. (e.g., "Adjust your storage **quota**.")
+- **`limit`**: The real-time numerical "ceiling." Use for error messages when a user is blocked. (e.g., "You've reached your request **limit**.")
+- **When blocked, combine them:** Explain the **limit** that was hit and the **quota** that is the remedy. (e.g., "You've reached the request **limit** for your developer **quota**.")
+- **Related terms:** Use `usage` for consumption tracking, `restriction` for fixed rules, and `reset` for when a limit refreshes.
+
+---
+
+## Detailed Guidelines
+
+### Definitions
+
+- **Quota is the "what":** It identifies the category of resource being managed (e.g., storage quota, GPU quota, request/prompt quota).
+- **Limit is the "how much":** It defines the numerical boundary.
+
+Use **quota** when referring to the administrative concept or the request for more. Use **limit** when discussing the specific point of exhaustion.
+
+### When to use "quota"
+
+Use this term for **account management, billing, and settings.** It describes the entitlement the user has purchased or been assigned.
+
+**Examples:**
+- **Navigation label:** Quota and usage
+- **Contextual help:** Your **usage quota** is managed by your organization. To request an increase, contact your administrator.
+
+### When to use "limit"
+
+Use this term for **real-time feedback, notifications, and error messages.** It identifies the specific wall the user just hit.
+
+**Examples:**
+- **Error message:** You’ve reached the 50-request-per-minute **limit**.
+- **Inline warning:** Input exceeds the 32k token **limit**.
+
+### How to use both together
+
+When a user is blocked, combine both terms to explain the **event** (limit) and the **remedy** (quota).
+
+**Example:**
+- **Heading:** Daily usage limit reached
+- **Body:** You've reached the maximum daily capacity for your developer quota. To continue working today, upgrade your quota.