Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/fetch.md

@@ -1,32 +1,38 @@
-# fetch
+---
+title: fetch
+layout: command
+version: 0.59.0
+---
 
-This command loads from a URL into a cell, convert it to table if possible (avoid by appending `--raw` flag)
+Fetch the contents from a URL (HTTP GET operation).
+
+## Signature
+
+```> fetch (URL) --user --password --timeout --headers --raw```
+
+## Parameters
+
+ -  `URL`: the URL to fetch the contents from
+ -  `--user {any}`: the username when authenticating
+ -  `--password {any}`: the password when authenticating
+ -  `--timeout {int}`: timeout period in seconds
+ -  `--headers {any}`: custom headers you want to add 
+ -  `--raw`: fetch contents as text rather than a table
 
 ## Examples
 
+Fetch content from url.com
 ```shell
-> fetch http://headers.jsontest.com
-━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━
- X-Cloud-Trace-Context                                 │ Accept │ Host                 │ Content-Length │ user-agent
-───────────────────────────────────────────────────────┼────────┼──────────────────────┼────────────────┼─────────────────────────
- aeee1a8abf08820f6fe19d114dc3bb87/16772233176633589121 │ */*    │ headers.jsontest.com │ 0              │ curl/7.54.0 isahc/0.7.1
-━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━
-> fetch http://headers.jsontest.com --raw
-{
-   "X-Cloud-Trace-Context": "aeee1a8abf08820f6fe19d114dc3bb87/16772233176633589121",
-   "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3",
-   "Upgrade-Insecure-Requests": "1",
-   "User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.90 Safari/537.36",
-   "Host": "headers.jsontest.com",
-   "Accept-Language": "en-GB,en-US;q=0.9,en;q=0.8"
-}
+> fetch url.com
 ```
 
+Fetch content from url.com, with username and password
 ```shell
-> fetch https://www.jonathanturner.org/feed.xml
-━━━━━━━━━━━━━━━━
- rss
-────────────────
- [table: 1 row]
-━━━━━━━━━━━━━━━━
+> fetch -u myuser -p mypass url.com
 ```
+
+Fetch content from url.com, with custom header
+```shell
+> fetch -H [my-header-key my-header-value] url.com
+```
+