Correct typo in in-page anchor (#23777)

Fixes https://github.com/twbs/bootstrap/issues/23773

diff --git a/docs/4.0/components/forms.md b/docs/4.0/components/forms.md
index eb3deb415c2086fc5169c92c1a7a0f59b4b4b14d..80c5db54709b18cbf9fa9119e2336ebd489ee822 100644 (file)
--- a/docs/4.0/components/forms.md
+++ b/docs/4.0/components/forms.md
@@ -684,7 +684,7 @@ Here's how form validation works with Bootstrap:
 - As a fallback, `.is-invalid` and `.is-valid` classes may be used instead of the pseudo-classes for [server side validation](#server-side). They do not require a `.was-validated` parent class.
 - Due to constraints in how CSS works, we cannot (at present) apply styles to a `<label>` that comes before a form control in the DOM without the help of custom JavaScript.
 - All modern browsers support the [constraint validation API](https://www.w3.org/TR/html5/forms.html#the-constraint-validation-api), a series of JavaScript methods for validating form controls.
-- Feedback messages may utilize the [browser defaults](#browser-default) (different for each browser, and unstylable via CSS) or our custom feedback styles with additional HTML and CSS.
+- Feedback messages may utilize the [browser defaults](#browser-defaults) (different for each browser, and unstylable via CSS) or our custom feedback styles with additional HTML and CSS.
 - You may provide custom validity messages with `setCustomValidity` in JavaScript.
 
 With that in mind, consider the following demos for our custom form validation styles, optional server side classes, and browser defaults.