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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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@ -12,7 +12,7 @@ If you are not yet familiar with placeholders, start by reading [here](/docs/con
## Placeholder Internals
Internally, placeholders are simply a string in format `{foo.bar}` used as valid configuration values, which is later parsed at runtime.
Placeholders are a string in the format `{foo.bar}` used as dynamic configuration values, which is later evaluated at runtime.
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.