severity_parser: update docs to correct overwrite_text name (open-tel…

…emetry#36103)

pkg/stanza/docs/types/severity.md

@@ -13,9 +13,9 @@ Parser operators can parse a severity and attach the resulting value to a log en
 | `parse_from`     | required  | The [field](../types/field.md) from which the value will be parsed. |
 | `preset`         | `default` | A predefined set of values that should be interpretted at specific severity levels. |
 | `mapping`        |           | A custom set of values that should be interpretted at designated severity levels. |
-| `overwrite_with` | `false`   | If `true`, the severity text will be set to the [recommeneded short name](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#displaying-severity) corresponding to the severity number. |
+| `overwrite_text` | `false`   | If `true`, the severity text will be set to the [recommeneded short name](https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#displaying-severity) corresponding to the severity number. |
 
-Note that by default the severity _text_ will be set to the original value which was interpreted into a severity number. In order to set the severity text to a standard short name (e.g. `ERROR`, `INFO3`, etc.), set `overwrite_with` to `true`.
+Note that by default the severity _text_ will be set to the original value which was interpreted into a severity number. In order to set the severity text to a standard short name (e.g. `ERROR`, `INFO3`, etc.), set `overwrite_text` to `true`.
 
 ### How severity `mapping` works