Update src/docs/markdown/extending-caddy/placeholders.md

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
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@ -18,7 +18,7 @@ Placeholders-like strings which start with a dollar sign (`{$FOO}`), are evaulat
It is therefore important to understand that `{env.HOST}` is inherently different from something like `{$HOST}`. It is therefore important to understand that `{env.HOST}` is inherently different from something like `{$HOST}`.
As an example, see the following caddyfile: As an example, see the following Caddyfile:
```caddyfile ```caddyfile
:8080 { :8080 {
respond {$HOST} 200 respond {$HOST} 200