doc: fix missing periods in url.markdown

PR-URL: #1115
Reviewed-By: Jeremiah Senkpiel <fishrock123@rocketmail.com>

doc/api/url.markdown

@@ -19,7 +19,7 @@ string will not be in the parsed object. Examples are shown for the URL
 
     Example: `'http:'`
 
-* `slashes`: The protocol requires slashes after the colon
+* `slashes`: The protocol requires slashes after the colon.
 
     Example: true or false
 
@@ -89,14 +89,14 @@ Here's how the formatting process works:
   * The protocols `http`, `https`, `ftp`, `gopher`, `file` will be
     postfixed with `://` (colon-slash-slash).
   * All other protocols `mailto`, `xmpp`, `aim`, `sftp`, `foo`, etc will
-    be postfixed with `:` (colon)
+    be postfixed with `:` (colon).
 * `slashes` set to `true` if the protocol requires `://` (colon-slash-slash)
   * Only needs to be set for protocols not previously listed as requiring
-    slashes, such as `mongodb://localhost:8000/`
+    slashes, such as `mongodb://localhost:8000/`.
 * `auth` will be used if present.
 * `hostname` will only be used if `host` is absent.
 * `port` will only be used if `host` is absent.
-* `host` will be used in place of `hostname` and `port`
+* `host` will be used in place of `hostname` and `port`.
 * `pathname` is treated the same with or without the leading `/` (slash).
 * `query` (object; see `querystring`) will only be used if `search` is absent.
 * `search` will be used in place of `query`.