chore(tabs): mark beta version available

PiperOrigin-RevId: 532864428

Author: material-web-copybara

README.md

@@ -53,7 +53,7 @@ Ripple                        | ✅     | ✅    | 🟡
 Select                        | ✅     | ✅    | ❌
 Slider                        | ✅     | ✅    | ❌
 Switch                        | ✅     | ✅    | ❌
-Tabs                          | ✅     | 🟡    | ❌
+Tabs                          | ✅     | ✅    | ❌
 Text field                    | ✅     | ✅    | 🟡
 
 ### 1.1+ Components

tabs/lib/_tab.scss

@@ -112,7 +112,6 @@
     align-items: center;
     justify-content: center;
 
-    // TODO (b/261201556) replace with spacing token
     $_content-padding: 8px;
     // tabs are naturally sized up to their max height.
     max-height: calc(var(--_container-height) + 2 * $_content-padding);