Update README.md (#1375)

More minor textual fixes.

plugin/auto/README.md

@@ -2,14 +2,14 @@
 
 ## Name
 
-*auto* - enables serving zone data from an RFC 1035-style master file which is automatically picked up from disk.
+*auto* - enables serving zone data from an RFC 1035-style master file, which is automatically picked up from disk.
 
 ## Description
 
 The *auto* plugin is used for an "old-style" DNS server. It serves from a preloaded file that exists
-on disk. If the zone file contains signatures (i.e. is signed, i.e. DNSSEC) correct DNSSEC answers
-are returned. Only NSEC is supported! If you use this setup *you* are responsible for resigning the
-zonefile. New zones or changed zone are automatically picked up from disk.
+on disk. If the zone file contains signatures (i.e. is signed, i.e. using DNSSEC) correct DNSSEC answers
+are returned. Only NSEC is supported! If you use this setup *you* are responsible for re-signing the
+zonefile. New or changed zones are automatically picked up from disk.
 
 ## Syntax
 
@@ -26,15 +26,15 @@ are used.
 
 * `directory` loads zones from the speficied **DIR**. If a file name matches **REGEXP** it will be
   used to extract the origin. **ORIGIN_TEMPLATE** will be used as a template for the origin. Strings
-  like `{<number>}` are replaced with the respective matches in the file name, i.e. `{1}` is the
-  first match, `{2}` is the second, etc.. The default is: `db\.(.*)  {1}` e.g. from a file with the
+  like `{<number>}` are replaced with the respective matches in the file name, e.g. `{1}` is the
+  first match, `{2}` is the second. The default is: `db\.(.*)  {1}` i.e. from a file with the
   name `db.example.com`, the extracted origin will be `example.com`. **TIMEOUT** specifies how often
-  CoreDNS should scan the directory, the default is every 60 seconds. This value is in seconds.
+  CoreDNS should scan the directory; the default is every 60 seconds. This value is in seconds.
   The minimum value is 1 second.
 * `no_reload` by default CoreDNS will try to reload a zone every minute and reloads if the
   SOA's serial has changed. This option disables that behavior.
 * `upstream` defines upstream resolvers to be used resolve external names found (think CNAMEs)
-  pointing to external names. **ADDRESS** can be an IP address, and IP:port or a string pointing to
+  pointing to external names. **ADDRESS** can be an IP address, an IP:port or a string pointing to
   a file that is structured as /etc/resolv.conf.
 
 All directives from the *file* plugin are supported. Note that *auto* will load all zones found,