add documentation for from-json, from-yaml, history, split-row

docs/commands/from-json.md

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+# from-json
+
+Parse text as `.json` and create table. Use this when nushell cannot dertermine the input file extension.
+
+Syntax: `from-json {flags}`
+
+### Flags:
+
+    --objects
+      treat each line as a separate value
+
+
+## Examples
+
+```shell
+> open command_from-json
+[
+    {
+        title: "from-json",
+        type: "command",
+        flags: true
+    }
+]
+```
+
+```shell
+> open command_from-json | from-json
+━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━
+ title     │ type    │ flags 
+───────────┼─────────┼───────
+ from-json │ command │ Yes 
+━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━
+```

docs/commands/from-yaml.md

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+# from-yaml
+
+Parse text as `.yaml/.yml` and create table.
+
+Syntax: `from-yaml`
+
+## Examples
+
+```shell
+> open command_from-yaml
+title: from-yaml
+type: command
+flags: false
+```
+
+```shell
+> open command_from-yaml | from-yaml
+━━━━━━━━━━━┯━━━━━━━━━┯━━━━━━━
+ title     │ type    │ flags 
+───────────┼─────────┼───────
+ from-yaml │ command │ No 
+━━━━━━━━━━━┷━━━━━━━━━┷━━━━━━━
+
+```

docs/commands/history.md

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+# history
+
+Displays the last 100 commands.
+
+## Example
+
+```shell
+> history
+━━━━┯━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+ #  │ <value> 
+────┼───────────────────────────────────────────────────────────────────────────
+   ...
+ 97 │ ls 
+ 98 │ ls | where accessed < 1d 
+ 99 │ cd 
+━━━━┷━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+```

docs/commands/split-row.md

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+# split-row
+
+Split row contents over multiple rows via the separator.
+
+Syntax: `split-row <separator>`
+
+### Parameters:
+* `<separator>` the character that denotes what separates rows
+
+## Examples
+
+We can build a table from a file that looks like this
+
+```shell
+> open table.txt
+4, 0, 2, 0, 7, 8
+
+```
+
+using the `split-row` command.
+
+```shell
+open table.txt | split-row ", "
+━━━┯━━━━━━━━━
+ # │ <value> 
+───┼─────────
+ 0 │ 4 
+ 1 │ 0 
+ 2 │ 2 
+ 3 │ 0 
+ 4 │ 7 
+ 5 │ 8 
+━━━┷━━━━━━━━━
+```