Updated DNS API Dev Guide (markdown)

DNS-API-Dev-Guide.md

@@ -20,19 +20,21 @@ acme.sh --issue -d example.com  --dns  dns_myapi
 Here we go:
 
 ### 1. The cloudflare dns api is a recommended reference:
-
+    Read it first:
     https://github.com/Neilpang/acme.sh/blob/master/dnsapi/dns_cf.sh
 
 ### 2. The script file name must be `myapi.sh`
+
     The file name must be in this format: `yourApiName.sh`, in this example, it should be `myapi.sh`
 
 ### 3. The file can be placed in `acme.sh/` folder, or in `acme.sh/dnsapi/` subfolder.
-If you want to contribute your script to `acme.sh` project,  it must be placed in `acme.sh/dnsapi/` folder.
 
+    If you want to contribute your script to `acme.sh` project,  it must be placed in `acme.sh/dnsapi/` folder.  
     If you just want to use your script on your machine, you can put it in `.acme.sh/` or `.acme.sh/dnsapi/` folders.
     acme.sh searches the script files in either the  acme.sh home dir(`.acme.sh/`) or in the  `dnsapi` subfolder(`.acme.sh/dnsapi`).
 
 ### 4. The file shebang must be `sh` not `bash`
+
     acme.sh is a `unix shell` script,  not just a `bash` script.
 
     If you want to contribute your script, the shebang must be: 
@@ -253,6 +255,9 @@ Example: https://github.com/Neilpang/acme.sh/issues/2057
 Please follow the guide: https://github.com/acmesh-official/acme.sh/wiki/DNS-API-Test
 
 
+### 12. Others
+    1. Don't use `grep -o` options, please use `_egrep_o()` function instead.
+    2. Don't use `curl` or `wget`,  please use `_get()` or `_post()` function instead.  The `_post()` function can send `POST`, `PUT` or `UPDATE` requests.
 
 
 ## Style Guidelines