Big Caddyfile docs update (#374)

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

@@ -21,12 +21,19 @@ uri [<matcher>] path_regexp  <target> <replacement>
 ```
 
 - The first (non-matcher) argument specifies the operation:
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 	- **strip_prefix** strips the prefix from the path.
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 	- **strip_suffix** strips the suffix from the path.
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 	- **replace** performs a substring replacement across the whole URI.
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 	- **path_regexp** performs a regular expression replacement on the path portion of the URI.
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 - **&lt;target&gt;** is the prefix, suffix, or search string/regular expression. If a prefix, the leading forward slash may be omitted, since paths always start with a forward slash.
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 - **&lt;replacement&gt;** is the replacement string (only valid with `replace` and `path_regexp`). Supports using capture groups with `$name` or `${name}` syntax, or with a number for the index, such as `$1`. See the [Go documentation](https://golang.org/pkg/regexp/#Regexp.Expand) for details.
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 - **&lt;limit&gt;** is an optional limit to the maximum number of replacements (only valid with `replace`).
 
 URI mutations occur on the normalized or unescaped form of the URI. However, escape sequences can be used in the prefix or suffix patterns to match only those literal escapes at those positions in the request path. For example, `uri strip_prefix /a/b` will rewrite both `/a/b/c` and `/a%2Fb/c` to `/c`; and `uri strip_prefix /a%2Fb` will rewrite `/a%2Fb/c` to `/c`, but won't match `/a/b/c`.
@@ -38,6 +45,7 @@ The URI path is cleaned of directory traversal dots before modifications. Additi
 Some other directives can also manipulate the request URI.
 
 - [`rewrite`](rewrite) changes the entire path and query to a new value instead of partially changing the value.
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 - [`handle_path`](handle_path) does the same as [`handle`](handle), but it strips a prefix from the request before running its handlers. Can be used instead of `uri strip_prefix` to eliminate one extra line of configuration in many cases.