Update evaluation.md

wording

Author: mikekgfb

torchchat/utils/docs/evaluation.md

@@ -15,7 +15,7 @@ library.
 
 ## Usage
 
-The evaluation mode of `torchchat.py` script can be used to evaluate your language model on various tasks available in the `lm_eval` library such as "wikitext". You can specify the task(s) you want to evaluate using the `--tasks` option, and limit the evaluation using the `--limit` option. If no task is specified, it will default to evaluating on "wikitext".
+The evaluation mode of `torchchat.py` script can be used to evaluate your language model on various tasks available in the `lm_eval` library such as "wikitext". You can specify the task(s) you want to evaluate using the `--tasks` option, and limit the evaluation using the `--limit` option. If no task is specified, the task will default to evaluating on "wikitext".
 
 **Examples**