Inline single-use snippets and remove unused snippet files

- Inline html-video-syntax-callout.mdx content directly into markdown-media.mdx
- Inline version-number-postman.mdx (0.4.3) directly into publishing-to-postman.mdx
- Delete html-video-syntax-callout.mdx and version-number-postman.mdx snippet files

These snippets were only used in a single file each, so inlining them
reduces indirection and simplifies the codebase.

Author: fern-api[bot]

fern/products/docs/pages/component-library/writing-content/markdown-media.mdx

@@ -69,7 +69,9 @@ Embed PDFs using the `<iframe>` element. Don't use the `<embed>` element, as it
 
 You can embed videos in your documentation using the HTML `<video>` tag. This gives you control over video playback settings like autoplay, looping, and muting. Don't use the `<embed>` element, as it has inconsistent browser support.
 
-<Markdown src="/snippets/html-video-syntax-callout.mdx" />
+<Warning>
+  `.mdx` files use JSX syntax, not pure HTML. Attributes for HTML elements like `<video>` and `<iframe>` that are embedded in `.mdx` pages must be written in `camelCase` rather than lowercase. For example, use `autoPlay` instead of `autoplay`.
+</Warning>
 
 <Tabs>
 <Tab title="Rendered video">
@@ -138,7 +140,9 @@ For more details about the HTML video element and its attributes, see the [MDN d
 
 You can embed videos from YouTube, Loom, Vimeo, and other streaming platforms using an `<iframe>` element.
 
-<Markdown src="/snippets/html-video-syntax-callout.mdx" />
+<Warning>
+  `.mdx` files use JSX syntax, not pure HTML. Attributes for HTML elements like `<video>` and `<iframe>` that are embedded in `.mdx` pages must be written in `camelCase` rather than lowercase. For example, use `autoPlay` instead of `autoplay`.
+</Warning>
 
 <Tabs>
   <Tab title="Rendered Loom video">

fern/products/sdks/overview/postman/publishing-to-postman.mdx

@@ -64,7 +64,7 @@ You'll need to update your `generators.yml` file to configure the output locatio
       postman: # Group name for your Postman collection
         generators:
           - name: fernapi/fern-postman
-            version: <Markdown src="/snippets/version-number-postman.mdx"/>
+            version: 0.4.3
             output:
               location: postman
     ```
@@ -79,7 +79,7 @@ groups:
   postman:
     generators:
       - name: fernapi/fern-postman
-      version: <Markdown src="/snippets/version-number-postman.mdx"/>
+      version: 0.4.3
       output:
         location: postman
       github: 
@@ -102,7 +102,7 @@ groups:
   postman:
     generators:
       - name: fernapi/fern-postman
-      version: <Markdown src="/snippets/version-number-postman.mdx"/>
+      version: 0.4.3
       output:
         location: postman
       github: 
@@ -120,7 +120,7 @@ groups:
   postman:
     generators:
       - name: fernapi/fern-postman
-      version: <Markdown src="/snippets/version-number-postman.mdx"/>
+      version: 0.4.3
       output:
         location: postman
         api-key: ${POSTMAN_API_KEY}
@@ -152,7 +152,7 @@ groups:
   postman:
     generators:
       - name: fernapi/fern-postman
-        version: <Markdown src="/snippets/version-number-postman.mdx"/>
+        version: 0.4.3
         output:
           location: postman
           api-key: ${POSTMAN_API_KEY}
@@ -187,7 +187,7 @@ groups:
   postman:
     generators:
       - name: fernapi/fern-postman
-        version: <Markdown src="/snippets/version-number-postman.mdx"/>
+        version: 0.4.3
         output:
           location: postman
           api-key: ${POSTMAN_API_KEY}