fix minor spell mistake

<!-- ## READ BEFORE OPENING A PR Thank you for contributing to hugo-PaperMod! Please fill out the following questions to make it easier for us to review your changes. You do not need to check all the boxes below. **NOTE**: PaperMod does not have any external dependencies fetched from 3rd party CDN servers. However we do have custom Head/Footer extender templates which you can use to add those to your website. https://github.com/adityatelange/hugo-PaperMod/wiki/FAQs#custom-head--footer --> **What does this PR change? What problem does it solve?** a single letter spelling mistake **Was the change discussed in an issue or in the Discussions before?** not to m,y knowledge ## PR Checklist - [ ] This change adds/updates translations and I have used the [template present here](https://github.com/adityatelange/hugo-PaperMod/wiki/Translations#want-to-add-your-language-). - [x] I have enabled [maintainer edits for this PR](https://help.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork). - [ ] I have verified that the code works as described/as intended. - [ ] This change adds a Social Icon which has a permissive license to use it. - [x] This change **does not** include any CDN resources/links. - [x] This change **does not** include any unrelated scripts such as bash and python scripts. - [ ] This change updates the overridden internal templates from HUGO's repository.