Autogenerate missing docs (#3514)

* Autogenerate missing docs

* Update ansi.md

* Rename question mark command docs

* Delete empty?.md

docs/commands/drop-column.md

@@ -0,0 +1,20 @@
+# drop column
+Remove the last number of columns. If you want to remove columns by name, try 'reject'.
+
+## Usage
+```shell
+> drop column (columns) {flags} 
+ ```
+
+## Parameters
+* `(columns)` starting from the end, the number of columns to remove
+
+## Flags
+* -h, --help: Display this help message
+
+## Examples
+  Remove the last column of a table
+```shell
+> echo [[lib, extension]; [nu-lib, rs] [nu-core, rb]] | drop column
+ ```
+