docs: fix typos in styling files (#27537)

Author: aanchal88

src/material/core/selection/pseudo-checkbox/_pseudo-checkbox-common.scss

@@ -42,7 +42,7 @@ $padding: checkbox-common.$border-width * 2;
 // `$box-size`: size of the checkbox.
 // `$border-size`: size of the checkbox's border.
 @mixin _checkbox-indeterminate-styles-with-size($box-size, $border-size) {
-  // Center the line in the the checkbox. `$checkbox-common.$border-width` is the width of the line.
+  // Center the line in the checkbox. `$checkbox-common.$border-width` is the width of the line.
   top: math.div($box-size - checkbox-common.$border-width, 2) - $border-size;
   width: $box-size - checkbox-common.$border-width - (2 * $border-size);
 }

src/material/core/tokens/m2/mdc/_circular-progress.scss

@@ -16,7 +16,7 @@ $prefix: (mdc, circular-progress);
   @return (
     // The thickness of the progress spinner's active indicator.
     active-indicator-width: 4px,
-    // The the diameter of the spinner
+    // The diameter of the spinner
     size: 48px,
     // =============================================================================================
     // = TOKENS NOT USED IN ANGULAR MATERIAL                                                       =

src/material/core/tokens/m2/mdc/_plain-tooltip.scss

@@ -51,9 +51,9 @@ $prefix: (mdc, plain-tooltip);
     // Font for the tooltip text.
     supporting-text-font: typography-utils.font-family($config, caption)
     or typography-utils.font-family($config),
-    // Font size for the the tooltip text.
+    // Font size for the tooltip text.
     supporting-text-size: typography-utils.font-size($config, caption),
-    // Font weight of the the tooltip text.
+    // Font weight of the tooltip text.
     supporting-text-weight: typography-utils.font-weight($config, caption),
     // Tracking (space between letters) of the tooltip text.
     supporting-text-tracking: typography-utils.letter-spacing($config, caption),

src/material/list/list.scss

@@ -172,7 +172,7 @@ a.mdc-list-item--activated {
   // Unscoped content can wrap if the list item has acquired three lines. MDC implements
   // this functionality for secondary text but there is no proper text ellipsis when
   // text overflows the third line. These styles ensure the overflow is handled properly.
-  // TODO: Move this to the the MDC list once it drops IE11 support.
+  // TODO: Move this to the MDC list once it drops IE11 support.
   .mat-mdc-list-item-unscoped-content.mdc-list-item__secondary-text {
     display: -webkit-box;
     -webkit-box-orient: vertical;