Do I correct it or leave it??
Please provide more information about the error and share the batch you are reviewing so we can better help you.
A name is misspelled.
The spelling should match what is on the form in the batch. If the name appears more than once, use the "Or" option.
I just found a video on the review process you might want to watch.
FamilySearch Web Indexing - The New Review Process 2020 (10 min)
A quick tutorial on how to review in FamilySearch indexing. May 18, 2020, by Jason Pierson
As the Reviewer of a batch from a given Project, you should correct any errors you find. You are usually only spared the labor of entering all the information that needs indexing. Otherwise, you follow the same rules as any Indexer. You provide a second look at the same data and correct the first Indexer's mistakes. Respect the first Indexer and don't be too quick to dismiss their interpretation, but use your best judgment and apply the Project Instructions.
Your job is to scrutinize each field on every entry to ensure that it is indexed perfectly according to all sections of the Project Instructions. These include the What to Index, What to Remember About This Project, General Indexing Guidelines (GIG) sections, and the Field Helps (purple question marks). You should always check the Instructions for the current part of that Project for any variations from previous ones, which often happens. And become familiar with the horizontal and vertical toolbars to help you do your job most efficiently.
So, yes, you should correct misspellings and any other errors. You are backing up the first Indexer to ensure that they didn't, for example, miss, misinterpret or misspell names on an image and didn't swap Given Names and Surnames. You should check that they saw and captured both pages of a two-page document, didn't index from the Reference Images unless they were supposed to (see GIG), correctly labeled images No Extractable Data (NED) or as duplicates, and for any other deviations from the instructions.
Ideally, you've Indexed or Reviewed so many records from that Project or similar previous parts of that Project that you know the current Project Instructions inside and out or know when to consult them. It would be best if you have pretty much memorized the General Indexing Guidelines section or know when to consult it. The GIG applies when a project doesn't have instructions to the contrary. And you should continually be checking the Field Helps for detailed information on a specific field or go back to the Indexing Examples as needed.
Once you click on the Field Help (FH) for a given field, if you go to another field, the FH changes accordingly. You can have that little window open all the time if you like, for easy reference.
And when in doubt, come to the Indexing Q&A forum, and ask, as you've done.