Add append command documentation

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# append
This command allows you to append the given row to the table.
**Note**:
- `append` does not change a file itself. If you want to save your changes, you need to run the `save` command
- if you want to add something containing a whitespace character, you need to put it in quotation marks
## Examples
Let's add more cities to this table:
```shell
> open cities.txt | lines
━━━┯━━━━━━━━━━━━
# │ <value>
───┼────────────
0 │ Canberra
1 │ London
2 │ Nairobi
3 │ Washington
━━━┷━━━━━━━━━━━━
```
You can add a new row by using `append`:
```shell
> open cities.txt | lines | append Beijing
━━━┯━━━━━━━━━━━━
# │ <value>
───┼────────────
0 │ Canberra
1 │ London
2 │ Nairobi
3 │ Washington
4 │ Beijing
━━━┷━━━━━━━━━━━━
```
It's not possible to add multiple rows at once, so you'll need to call `append` multiple times:
```shell
> open cities.txt | lines | append Beijing | append "Buenos Aires"
━━━┯━━━━━━━━━━━━━━
# │ <value>
───┼──────────────
0 │ Canberra
1 │ London
2 │ Nairobi
3 │ Washington
4 │ Beijing
5 │ Buenos Aires
━━━┷━━━━━━━━━━━━━━
```