docs: omit repetitions (#27753)

Author: aanchal88

src/material/form-field/_form-field-sizing.scss

@@ -3,7 +3,7 @@
 $mat-form-field-outline-top-spacing: 12px;
 
 // Infix stretches to fit the container, but naturally wants to be this wide. We set
-// this in order to have a a consistent natural size for the various types of controls
+// this in order to have a consistent natural size for the various types of controls
 // that can go in a form field.
 $mat-form-field-default-infix-width: 180px !default;
 

src/material/schematics/ng-generate/mdc-migration/rules/ts-migration/runtime-migration.ts

@@ -227,7 +227,7 @@ export class RuntimeCodeMigration extends Migration<ComponentMigrator[], Schemat
     // be additionally created because the migrations run in isolation.
     if (!this._templateMigration) {
       const templateUpgradeData = this.upgradeData.filter(component => component.template);
-      // If no component in the upgrade data has a a template migrator, stop
+      // If no component in the upgrade data has a template migrator, stop
       // trying to migrate any templates from now on
       if (templateUpgradeData.length === 0) {
         this._hasPossibleTemplateMigrations = false;