Here's How to Edit text in a scanned document in Adobe Acrobat:
Open the scanned PDF file in Acrobat.

Choose Tools > Edit PDF. Acrobat automatically applies OCR to your document and converts it to a fully editable copy of your PDF.

 
Note:
A prompt on the upper-right corner appears showing you the recognized OCR language. To change the language, click Settings in the prompt or in the right pane. For more information about the various options, see Options for editing scanned documents below.

Click the text element you want to edit and start typing. New text matches the look of the original fonts in your scanned image. For more information on editing text, see Edit text in PDFs.
Choose File > Save As and type a new name for your editable document.

Beware: If you do not have Acrobat, there are dozens of alternatives all claiming to be free but ultimately charge money for the service.
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