add documentation for save, config

docs/commands/config.md

@@ -0,0 +1,43 @@
+# config
+
+Configuration management.
+
+Syntax: `config {flags}`
+
+### Flags
+
+
+    --load <file path shape>
+      load the config from the path give
+
+    --set <any shape>
+      set a value in the config, eg) --set [key value]
+
+    --set_into <member shape>
+      sets a variable from values in the pipeline
+
+    --get <any shape>
+      get a value from the config
+
+    --remove <any shape>
+      remove a value from the config
+
+    --clear
+      clear the config
+
+    --path
+      return the path to the config file
+
+### Variables
+
+| Variable        | Type           | Description  |
+| ------------- | ------------- | ----- |
+| path | table of strings | PATH to use to find binaries |
+| env | row | the environment variables to pass to external commands |
+| ctrlc_exit | boolean | whether or not to exit Nu after multiple ctrl-c presses |
+| table_mode | "light" or other | enable lightweight or normal tables |
+| edit_mode | "vi" or "emacs" | changes line editing to "vi" or "emacs" mode |
+
+## Examples
+
+A more detailed description on how to use this command to configure Nu shell can be found in the configuration chapter of [Nu Book](https://book.nushell.sh/).

docs/commands/from-yaml.md

@@ -1,6 +1,6 @@
 # from-yaml
 
-Parse text as `.yaml/.yml` and create table.
+Parse text as `.yaml/.yml` and create table. Use this when nushell cannot dertermine the input file extension.
 
 Syntax: `from-yaml`
 

docs/commands/save.md

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+# save
+
+This command saves the contents of the pipeline to a file. Use this in combination with the `to-json`, `to-csv`, ... commands to save the contents in the specified format.
+
+Syntax: `save (path) {flags}`
+
+### Parameters:
+
+* `(path)` the path to save contents to
+
+### Flags
+
+    --raw
+      treat values as-is rather than auto-converting based on file extension
+
+## Example
+
+You can save the name of files in a directory like this:
+
+```shell
+> ls | where type == File | pick name | save
+```
+
+Or you can format it in supported formats using one of the `to-*` commands:
+
+```shell
+> ls | where type == File | pick name | to-csv | save
+```