docs(text-field,input): text-field headings don't have anchors (#16745)

update link from input docs to use new anchor

Fixes #16744.

Author: Splaktar

src/cdk/text-field/text-field.md

@@ -1,7 +1,7 @@
 The `text-field` package provides useful utilities for working with text input fields such as
 `<input>` and `<textarea>`.
 
-## Automatically resizing a `<textarea>`
+### Automatically resizing a `<textarea>`
 
 The `cdkTextareaAutosize` directive can be applied to any `<textarea>` to make it automatically
 resize to fit its content. The minimum and maximum number of rows to expand to can be set via the
@@ -14,7 +14,7 @@ affecting the `<textarea>` have changed.
 
 <!-- example(text-field-autosize-textarea) -->
 
-## Monitoring the autofill state of an `<input>`
+### Monitoring the autofill state of an `<input>`
 
 The `AutofillMonitor` is an injectable service that allows the user to monitor the autofill state of
 an `<input>`. It has a `monitor` method that takes an element to monitor and returns an
@@ -40,7 +40,7 @@ using Angular Material, you should include this CSS with the `cdk-text-field` mi
 @include cdk-text-field();
 ```
 
-## Styling the autofill state of an `<input>`
+### Styling the autofill state of an `<input>`
 
 It can be difficult to override the browser default `background` and `color` properties on an
 autofilled `<input>`. To make this simpler, the CDK includes a mixin `cdk-text-field-autofill-color`

src/material/input/input.md

@@ -81,7 +81,7 @@ available in the CDK.
 ### Responding to changes in the autofill state of an `<input>`
 
 The CDK provides
-[utilities](https://material.angular.io/cdk/text-field/overview#monitoring-the-autofill-state-of-an-input)
+[utilities](https://material.angular.io/cdk/text-field/overview#monitoring-the-autofill-state-of-an-code-lt-input-gt-code-)
 for detecting when an input becomes autofilled and changing the appearance of the autofilled state.
 
 ### Accessibility