Fix grammar, heading level, and links for DNSLink

License: MIT
Signed-off-by: Rob Brackett <rob@robbrackett.com>

content/guides/concepts/dnslink.md

@@ -5,11 +5,12 @@ menu:
         parent: concepts
 ---
 
-DNSLink uses DNS TXT records to map a domain name (like `ipfs.io`) to an IPFS
-address. Because you can edit your DNS records, you can use them to always
-point to the latest version of an object in IPFS (remember that an IPFS
-object’s address changes if you modify the object). Because DNSLink uses DNS
-records, the names it produces are also usually easy to type and read.
+DNSLink uses [DNS TXT](https://en.wikipedia.org/wiki/TXT_record) records to map
+a domain name (like `ipfs.io`) to an IPFS address. Because you can edit your
+DNS records, you can use them to always point to the latest version of an
+object in IPFS (remember that an IPFS object’s address changes if you modify
+the object). Because DNSLink uses DNS records, the names it produces are also
+usually easy to type and read.
 
 A DNSLink address looks like an [IPNS](/guides/concepts/ipns) address, but it
 uses a domain name in place of a hashed public key:
@@ -24,16 +25,15 @@ Just like normal IPFS addresses, they can include links to other files:
 /ipns/ipfs.io/media/
 ```
 
-
 When an IPFS client or node attempts to resolve that address, it looks for a `TXT` record for `ipfs.io` with content like:
 
 ```
 dnslink=/ipfs/<CID for your content here>
 ```
 
-For example, if you look up `ipfs.io`’s DNS records, you’ll see its DNSLink entry.
+For example, if you look up `ipfs.io`’s DNS records, you’ll see its DNSLink entry:
 
-```
+```sh
 $ dig +noall +answer TXT ipfs.io
 ipfs.io.		59	IN	TXT	"dnslink=/ipfs/QmYNQJoKGNHTpPxCBPh9KkDpaExgd2duMa3aF6ytMpHdao"
 ```
@@ -50,27 +50,23 @@ Will get you this block:
 /ipfs/QmYNQJoKGNHTpPxCBPh9KkDpaExgd2duMa3aF6ytMpHdao/media/
 ```
 
-### Publish via Subdomain
 
-It is possible to publish DNSLink using a special subdomain named `_dnslink`.
+## Publishing via a Subdomain
 
-This is useful when you want to improve security of automated setup or
-delegate control over DNSLink to a third-party without giving full control over
-the original DNS zone.
+You can also publish DNSLink records using a special subdomain named `_dnslink`. This is useful when you want to improve the security of an automated setup or delegate control over your DNSLink records to a third-party without giving away full control over the original DNS zone.
 
-Example: `docs.ipfs.io` may not not have a TXT record, but the page still loads
-because TXT record exists for `_dnslink.docs.ipfs.io`:
+For example, [`docs.ipfs.io`](https://docs.ipfs.io) does not have a TXT record, but the page still loads
+because a TXT record exists for `_dnslink.docs.ipfs.io`:
 
-```
+```sh
 $ dig +noall +answer TXT _dnslink.docs.ipfs.io
 _dnslink.docs.ipfs.io.  34  IN  TXT "dnslink=/ipfs/QmeveuwF5wWBSgUXLG6p1oxF3GKkgjEnhA6AAwHUoVsx6E"
 ```
 
-<!-- Not sure if IPNS is fast enough to mention here
+<!-- TODO: Once IPNS is more reliable, describe combining it with DNSLink.
 ### Linking to IPNS
 
 DNSLink can point at [IPNS](/guides/concepts/ipns) paths as well. IPNS path is
 a mutable pointer which  enables you to update your website by publishing
 to a PeerID without the need for updating TXT record every time hash changes.
 -->
-