Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/each-window.md

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+# each window
+Runs a block on sliding windows of `window_size` rows of a table at a time.
+
+## Usage
+```shell
+> each window <window_size> <block> {flags} 
+ ```
+
+## Parameters
+* `<window_size>` the size of each window
+* `<block>` the block to run on each group
+
+## Flags
+* -h, --help: Display this help message
+* -s, --stride <integer>: the number of rows to slide over between windows
+
+## Examples
+  Echo the sum of each window
+```shell
+> echo [1 2 3 4] | each window 2 { echo $it | math sum }
+ ```
+