docs(material-experimental): fix scss examples

[macjohnny]

Fixes the error

Error: ./src/styles.scss
Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/sass-loader/dist/cjs.js):
SassError: Missing argument $config-or-theme.
   ┌──> src\styles.scss
14 │ @include mat-mdc-select-typography();
   │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ invocation
   ╵
   ┌──> node_modules\@angular\material-experimental\mdc-select\_select-theme.scss
82 │ @mixin mat-mdc-select-typography($config-or-theme) {
   │        ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ declaration
   ╵
  src\styles.scss 14:1  mat-mdc-select-typography()

Note: the same problem also occurs in

src\material-experimental\mdc-autocomplete  (1 usage found)
            README.md  (1 usage found)
                73 @include mat-mdc-autocomplete-typography();
        src\material-experimental\mdc-checkbox  (1 usage found)
            README.md  (1 usage found)
                69 @include mat-mdc-checkbox-typography();
        src\material-experimental\mdc-menu  (1 usage found)
            README.md  (1 usage found)
                73 @include mat-mdc-menu-typography();
        src\material-experimental\mdc-paginator  (1 usage found)
            README.md  (1 usage found)
                69 @include mat-mdc-paginator-typography();
        src\material-experimental\mdc-progress-bar  (1 usage found)
            README.md  (1 usage found)
                70 @include mat-mdc-progress-bar-typography();
        src\material-experimental\mdc-progress-spinner  (1 usage found)
            README.md  (1 usage found)
                70 @include mat-mdc-progress-spinner-typography();
        src\material-experimental\mdc-select  (1 usage found)
            README.md  (1 usage found)
                77 @include mat-mdc-select-typography();
        src\material-experimental\mdc-slide-toggle  (1 usage found)
            README.md  (1 usage found)
                69 @include mat-mdc-slide-toggle-typography();
        src\material-experimental\mdc-tabs  (1 usage found)
            README.md  (1 usage found)
                73 @include mat-mdc-tabs-typography();

[macjohnny]

alternatively, the default parameter could be set to null, similar to

components/src/material-experimental/mdc-typography/_all-typography.scss

Lines 3 to 10 in 2f61895

	@mixin angular-material-mdc-typography($config-or-theme: null) {
	$config: if(mat-private-is-theme-object($config-or-theme),
	mat-get-typography-config($config-or-theme), $config-or-theme);
	// If no actual color configuration has been specified, create a default one.
	@if $config == null {
	$config: mat-typography-config();
	}

[crisbeto]

LGTM

[macjohnny]

@crisbeto should I open a separate PR that fixes all other docs, too, or should I update this PR?

[crisbeto]

It's your call, docs PRs don't need to run through our presubmit process so it doesn't really matter if it's separate PRs or one large PR.

[macjohnny]

@crisbeto ok so I will add the additional doc fixes to this PR

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