Remove leftover abbr styles in Reboot for tooltips

/cc @GeoSot

scss/_reboot.scss

@@ -134,16 +134,14 @@ p {
 
 // Abbreviations
 //
-// 1. Duplicate behavior to the data-bs-* attribute for our tooltip plugin
-// 2. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
-// 3. Add explicit cursor to indicate changed behavior.
-// 4. Prevent the text-decoration to be skipped.
-
-abbr[title],
-abbr[data-bs-original-title] { // 1
-  text-decoration: underline dotted; // 2
-  cursor: help; // 3
-  text-decoration-skip-ink: none; // 4
+// 1. Add the correct text decoration in Chrome, Edge, Opera, and Safari.
+// 2. Add explicit cursor to indicate changed behavior.
+// 3. Prevent the text-decoration to be skipped.
+
+abbr[title] {
+  text-decoration: underline dotted; // 1
+  cursor: help; // 2
+  text-decoration-skip-ink: none; // 3
 }