Merge pull request JuliaLang#12949 from phaverty/patch-1

Update CONTRIBUTING.md

CONTRIBUTING.md

@@ -85,7 +85,7 @@ from Julia's root directory. Sometimes errors only show up in one of them, so if
 Existing docstrings now live primarily in `base/docs/helpdb.jl`.
 It is a goal over time to move the docstrings inline to their respective method definition.
 If you want to edit the body of a method docstring, you simply then need to run the `doc/genstdlib.jl` script to regenerate the restructured text files **after** you have already rebuilt Julia.
-If you want to edit an existing docstring signature, you **first** have to change the signature in the `doc/stdlib` `..function` or `..data` defnition (not the auto-generated content) and *then*
+If you want to edit an existing docstring signature, you **first** have to change the signature in the `doc/stdlib` `..function` or `..data` definition (not the auto-generated content) and *then*
 edit the helpdb.jl or inline method docstrings. The existing signatures in the `doc/stdlib/*.rst` files are patterned matched to base docstrings and the new content overwrites the content in `doc/stdlib/`.
 The signature definitions **must** be in sync or else the pattern match will fail and documentation will be lost in the result.
 To add entirely new methods to the `stdlib` documentation, first add the signature in the appropriate `rst/stdlib/*.rst` file before writing the docstring, rebuilding Julia, and re-running `doc/genstdlib.jl`.