`ie,` to `i.e.,`

Used:

```bash
find * -type f -exec sed -i 's/\bie,/i.e.,/g' {} \;
```
`ie` (without a comma) to `i.e.,`

Used:

```bash
find * -type f -exec sed -i 's/\bie\b/i.e.,/g' {} \;
```