docs: html tags updated (#27164)

Author: aanchal88

src/components-examples/material/chips/chips-form-control/chips-form-control-example.html

@@ -21,5 +21,5 @@
 </mat-form-field>
 
 <p>
-  <b>The following keywords are entered:</b> {{formControl.value}}
+  <strong>The following keywords are entered:</strong> {{formControl.value}}
 </p>

src/components-examples/material/form-field/form-field-label/form-field-label-example.html

@@ -28,7 +28,7 @@
           <mat-option>-- None --</mat-option>
           <mat-option value="option">Option</mat-option>
         </mat-select>
-        <mat-label><mat-icon>favorite</mat-icon> <b> Fancy</b> <em> label</em></mat-label>
+        <mat-label><mat-icon>favorite</mat-icon> <strong> Fancy</strong> <em> label</em></mat-label>
       </mat-form-field>
     </div>
   </form>

src/dev-app/input-modality/input-modality-detector-demo.html

@@ -9,7 +9,7 @@ <h2>Input Modality</h2>
 
     <p>
       Detected input modality:
-      <b>{{_modality || '(unknown)'}}</b>
+      <strong>{{_modality || '(unknown)'}}</strong>
     </p>
 
     <button mat-raised-button>Launch</button>

src/dev-app/input/input-demo.html

@@ -315,7 +315,7 @@ <h4>Textarea</h4>
       <mat-form-field>
         <input matInput>
         <mat-label>
-          I <mat-icon>favorite</mat-icon> <b>bold</b> label
+          I <mat-icon>favorite</mat-icon><strong>bold</strong> label
         </mat-label>
         <mat-hint>
           I also <mat-icon>home</mat-icon> <em>italic</em> hint labels