fix(multiselect): typo in the templating demo

[dalenguyen]

Fix #13356

Fix MultiSelect Template example

<p-multiSelect [options]="countries" [(ngModel)]="selectedCountries" defaultLabel="Select a Country" optionLabel="name" >
        <ng-template let-value pTemplate="selectedItems">
            <div class="flex align-items-center gap-2" *ngFor="let option of selectedCountries1">
                <img src="https://primefaces.org/cdn/primeng/images/demo/flag/flag_placeholder.png" [class]="'flag flag-' + option.code.toLowerCase()" style="width: 18px"/>
                <div>{{ option.name }}</div>
            </div>
            <div *ngIf="!selectedCountries1 || selectedCountries1.length === 0">Select Countries</div>
        </ng-template>
        <ng-template let-country pTemplate="item">
            <div class="flex align-items-center gap-2">
                <img src="https://primefaces.org/cdn/primeng/images/demo/flag/flag_placeholder.png" [class]="'flag flag-' + country.code.toLowerCase()" style="width: 18px"/>
                <div>{{ country.name }}</div>
            </div>
        </ng-template>
</p-multiSelect>

Change selectedCountries1 -> selectedCountries

Final result

[vercel]

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