Auto-generate markdown command docs (#4451)

* Finish updating

* a couple improvements

* Update renames

* cleanup examples

docs/commands/dfr_open.md

@@ -0,0 +1,28 @@
+---
+title: dfr open
+layout: command
+version: 0.59.0
+---
+
+Opens csv, json or parquet file to create dataframe
+
+## Signature
+
+```> dfr open (file) --delimiter --no-header --infer-schema --skip-rows --columns```
+
+## Parameters
+
+ -  `file`: file path to load values from
+ -  `--delimiter {string}`: file delimiter character. CSV file
+ -  `--no-header`: Indicates if file doesn't have header. CSV file
+ -  `--infer-schema {number}`: Number of rows to infer the schema of the file. CSV file
+ -  `--skip-rows {number}`: Number of rows to skip from file. CSV file
+ -  `--columns {list<string>}`: Columns to be selected from csv file. CSV and Parquet file
+
+## Examples
+
+Takes a file name and creates a dataframe
+```shell
+> dfr open test.csv
+```
+