Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/path_relative-to.md

@@ -0,0 +1,34 @@
+---
+title: path relative-to
+layout: command
+version: 0.59.0
+---
+
+Get a path as relative to another path.
+
+## Signature
+
+```> path relative-to (path) --columns```
+
+## Parameters
+
+ -  `path`: Parent shared with the input path
+ -  `--columns {table}`: Optionally operate by column path
+
+## Examples
+
+Find a relative path from two absolute paths
+```shell
+> '/home/viking' | path relative-to '/home'
+```
+
+Find a relative path from two absolute paths in a column
+```shell
+> ls ~ | path relative-to ~ -c [ name ]
+```
+
+Find a relative path from two relative paths
+```shell
+> 'eggs/bacon/sausage/spam' | path relative-to 'eggs/bacon/sausage'
+```
+