Update #4455, Regenerate all commands' docs (#4557)

docs/commands/detect_columns.md

@@ -8,10 +8,22 @@ splits contents across multiple columns via the separator.
 
 ## Signature
 
-```> detect columns --skip --no_headers```
+```> detect columns --skip --no-headers```
 
 ## Parameters
 
  -  `--skip {int}`: number of rows to skip before detecting
- -  `--no_headers`: don't detect headers
+ -  `--no-headers`: don't detect headers
+
+## Examples
+
+Splits string across multiple columns
+```shell
+> echo 'a b c' | detect columns -n
+```
+
+Splits a multi-line string into columns with headers detected
+```shell
+> echo $'c1 c2 c3(char nl)a b c' | detect columns
+```