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

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Co-authored-by: Matt Holt <mholt@users.noreply.github.com>
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@ -16,7 +16,7 @@ Placeholders are a string in the format `{foo.bar}` used as dynamic configuratio
Placeholders-like strings which start with a dollar sign (`{$FOO}`), are evaulated at Caddyfile parse time, and do not need to be dealt with by your plugin. This is because these are not placeholders, but Caddyfile-specific [environmental variable substitution](/docs/caddyfile/concepts#environment-variables), they just happen to share the `{}` syntax.
It is therefore important to understand that `{env.HOST}` is inherently different from something like `{$HOST}`
It is therefore important to understand that `{env.HOST}` is inherently different from something like `{$HOST}`.
As an example, see the following caddyfile:
```caddyfile