Revert "caddyfile: snippet block input documentation (#400)"

This reverts commit 41470c4e02.

src/docs/markdown/caddyfile/concepts.md

@@ -413,29 +413,6 @@ b.example.com {
 }
 ```
 
-⚠️ <i>Experimental</i> <span style='white-space: pre;'> | </span> <span>v2.9.x+</span>
-
-You can also pass an optional block to an imported snippet, and use them as follows.
-
-```caddy
-(snippet) {
-	{block}
-	respond "OK"
-}
-
-a.example.com {
-	import snippet {
-		header +foo bar
-	}
-}
-
-b.example.com {
-	import snippet {
-		header +bar foo
-	}
-}
-```
-
 **[Read the `import` directive page](/docs/caddyfile/directives/import) to learn more.**
 
 

src/docs/markdown/caddyfile/directives/import.md

@@ -11,7 +11,7 @@ This directive is a special case: it is evaluated before the structure is parsed
 ## Syntax
 
 ```caddy-d
-import <pattern> [<args...>] [{block}]
+import <pattern> [<args...>]
 ```
 
 - **&lt;pattern&gt;** is the filename, glob pattern, or name of [snippet](/docs/caddyfile/concepts#snippets) to include. Its contents will replace this line as if that file's contents appeared here to begin with.
@@ -34,11 +34,6 @@ import <pattern> [<args...>] [{block}]
 
   Note that prior to v2.7.0, the syntax was `{args.N}` but this form was deprecated in favor of the more flexible syntax above.
 
-⚠️ <i>Experimental</i> <span style='white-space: pre;'> | </span> <span>v2.9.x+</span>
-- **{block...}** is an optional block to pass to the imported tokens. This placeholder is a special case, and is evaluated recursively at Caddyfile-parse-time, not at runtime. They can be used in two forms:
-  - `{block}` where the content of provided block will be substituted for the placeholder.
-  - `{block.key}` where `key` is the first token of a parameter within the provided block
-
 
 ## Examples
 
@@ -90,48 +85,3 @@ example.com {
 	import proxy-rewrite /api 10.0.0.1 10.0.0.2 10.0.0.3
 }
 ```
-
-
-⚠️ <i>Experimental</i> <span style='white-space: pre;'> | </span> <span>v2.9.x+</span>
-
-Import a snippet which provides extendable options for a reverse proxy
-
-```caddy
-(extendable-proxy) {
-	reverse_proxy {
-		to {block.proxy_target}
-		{block.proxy_options}
-	}
-}
-
-example.com {
-	import extendable-proxy {
-	  proxy_target 10.0.0.1
-	  proxy_options {
-		transport http {
-			tls
-		}
-	  }
-	}
-}
-```
-
-Import a snippet that serves any set of directives, but with a pre-loaded middleware.
-
-```caddy
-(instrumented-route) {
-	header {
-	  Alt-Svc `h3="0.0.0.0:443"; ma=2592000`
-	}
-	tracing {
-		span args[0]
-	}
-	{block}
-}
-
-example.com {
-	import instrumented-route example-com {
-		respond "OK"
-	}
-}
-```