mod_auth: add some details to docs

src/modules/mod_auth.c

@@ -27,10 +27,13 @@
  *     auth.htpasswd ["realm": realm, "file": path];
  *         - requires authentication using a plaintext file containing user:encrypted_password pairs seperated by newlines (\n)
  *         - passwords are encrypted using crypt(3), use the htpasswd binary from apache to manage the file
+ *           + hashes starting with "$apr1$" are NOT supported (htpasswd -m)
+ *           + hashes starting with "{SHA}" ARE supported (followed by sha1_base64(password), htpasswd -s)
  *         - only supports "basic" method
  *     auth.htdigest ["method": method, "realm": realm, "file": path];
  *         - requires authentication using a plaintext file containing user:realm:hashed_password tuples seperated by newlines (\n)
- *         - passwords are saved as (modified) md5 hashes
+ *         - passwords are saved as (modified) md5 hashes:
+ *             md5hex(username + ":" + realm + ":" + password)
  *
  * Example config:
  *     # /members/ is for known users only