Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/do.md

@@ -1,32 +1,18 @@
-# do
-Runs a block, optionally ignoring errors.
+---
+title: do
+layout: command
+version: 0.59.0
+---
 
-## Usage
-```shell
-> do <block> ...args {flags} 
- ```
+Run a block
+
+## Signature
+
+```> do (block) ...rest --ignore-errors```
 
 ## Parameters
-* `<block>` the block to run 
-* ...args: the parameter(s) for the block
 
-## Flags
-* -h, --help: Display this help message
-* -i, --ignore-errors: ignore errors as the block runs
-
-## Examples
-  Run the block
-```shell
-> do { echo hello }
- ```
-
-  Run the block and ignore errors
-```shell
-> do -i { thisisnotarealcommand }
- ```
-
-  Run the block with a parameter
-```shell
-> do { |x| $x + 100 } 55
- ```
+ -  `block`: the block to run
+ -  `...rest`: the parameter(s) for the block
+ -  `--ignore-errors`: ignore errors as the block runs