Fix a typo

Author: bbatsov

.github/PULL_REQUEST_TEMPLATE.md

@@ -12,7 +12,7 @@ by checking the relevant checkboxes):
 - [ ] All code passes the linter (`make lint`) which is based on [`elisp-lint`](https://github.com/gonewest818/elisp-lint) and includes
   - [byte-compilation](https://www.gnu.org/software/emacs/manual/html_node/elisp/Byte-Compilation.html), [`checkdoc`](https://www.gnu.org/software/emacs/manual/html_node/elisp/Tips.html), [check-declare](https://www.gnu.org/software/emacs/manual/html_node/elisp/Declaring-Functions.html), packaging metadata, indentation, and trailing whitespace checks.
 - [ ] You've updated the [changelog](../blob/master/CHANGELOG.md) (if adding/changing user-visible functionality)
-- [ ] You've updated the [user manual](../blog/master/doc) (if adding/changing user-visible functionality)
+- [ ] You've updated the [user manual](../blob/master/doc) (if adding/changing user-visible functionality)
 
 Thanks!