Fix CSS typo: border-botton → border-bottom (#1975)

* Initial plan

* Fix CSS typo: border-botton -> border-bottom

Co-authored-by: barryvdh <973269+barryvdh@users.noreply.github.com>

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: barryvdh <973269+barryvdh@users.noreply.github.com>

Author: Copilot

resources/laravel-debugbar.css

@@ -296,7 +296,7 @@ div.phpdebugbar-widgets-sqlqueries table.phpdebugbar-widgets-explain {
 }
 
 div.phpdebugbar-widgets-sqlqueries table.phpdebugbar-widgets-explain th {
-    border-botton: 1px solid var(--debugbar-border);
+    border-bottom: 1px solid var(--debugbar-border);
     padding: 0 5px
 }