DOC fix the caption of installation tabs (scikit-learn#29393)

Author: Charlie-XIAO

doc/scss/install.scss

@@ -53,7 +53,7 @@
       content: "Operating System";
     }
 
-    &.tabs-packager::before {
+    &.tabs-package-manager::before {
       content: "Package Manager";
     }
   }