Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/into_datetime.md

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+---
+title: into datetime
+layout: command
+version: 0.59.0
+---
+
+converts text into datetime
+
+## Signature
+
+```> into datetime ...rest --list --timezone --offset --format```
+
+## Parameters
+
+ -  `...rest`: optionally convert text into datetime by column paths
+ -  `--list`: lists strftime cheatsheet
+ -  `--timezone {string}`: Specify timezone if the input is timestamp, like 'UTC/u' or 'LOCAL/l'
+ -  `--offset {int}`: Specify timezone by offset if the input is timestamp, like '+8', '-4', prior than timezone
+ -  `--format {string}`: Specify date and time formatting
+
+## Examples
+
+Convert to datetime
+```shell
+> '16.11.1984 8:00 am +0000' | into datetime
+```
+
+Convert to datetime
+```shell
+> '2020-08-04T16:39:18+00:00' | into datetime
+```
+
+Convert to datetime using a custom format
+```shell
+> '20200904_163918+0000' | into datetime -f '%Y%m%d_%H%M%S%z'
+```
+
+Convert timestamp (no larger than 8e+12) to datetime using a specified timezone
+```shell
+> '1614434140' | into datetime -z 'UTC'
+```
+
+Convert timestamp (no larger than 8e+12) to datetime using a specified timezone offset (between -12 and 12)
+```shell
+> '1614434140' | into datetime -o +9
+```
+