Document that file_server's hide can be used multiple times

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

@@ -60,7 +60,7 @@ file_server [<matcher>] [browse] {
 
 - **root** <span id="root"/> sets the path to the site root. It's similar to the [`root`](root) directive except it applies to this file server instance only and overrides any other site root that may have been defined. Default: `{http.vars.root}` or the current working directory. Note: This subdirective only changes the root for this handler. For other directives (like [`try_files`](try_files) or [`templates`](templates)) to know the same site root, use the [`root`](root) directive instead.
 
-- **hide** <span id="hide"/> is a list of files or folders to hide; if requested, the file server will pretend they do not exist. Accepts placeholders and glob patterns. Note that these are _file system_ paths, NOT request paths. In other words, relative paths use the current working directory as a base, NOT the site root; and all paths are transformed to their absolute form before comparisons (if possible). Specifying a file name or pattern without a path separator will hide all files with a matching name regardless of its location; otherwise, a path prefix match will be attempted, and then a globular match. Since this is a Caddyfile config, the active configuration file(s) will be added by default. Hide comparisons are case-sensitive; on case-insensitive filesystems, a differently-cased request path may still resolve to the same on-disk path, so `hide` should not be treated as a security boundary for sensitive paths.
+- **hide** <span id="hide"/> is a list of files or folders to hide; if requested, the file server will pretend they do not exist. Accepts placeholders and glob patterns. Note that these are _file system_ paths, NOT request paths. In other words, relative paths use the current working directory as a base, NOT the site root; and all paths are transformed to their absolute form before comparisons (if possible). Specifying a file name or pattern without a path separator will hide all files with a matching name regardless of its location; otherwise, a path prefix match will be attempted, and then a globular match. Since this is a Caddyfile config, the active configuration file(s) will be added by default. The subdirective may be specified more than once; each use appends to the list rather than replacing it, which lets an imported snippet contribute common hides that combine with site-specific hides. Hide comparisons are case-sensitive; on case-insensitive filesystems, a differently-cased request path may still resolve to the same on-disk path, so `hide` should not be treated as a security boundary for sensitive paths.
 
 - **index** <span id="index"/> is a list of filenames to look for as index files. Default: `index.html index.txt`