Embedding Projector: fix tooltips (#6325)

## Motivation for features / changes

fix broken/inconsistent tooltips

## Technical description of changes
Some places tooltips aren't showing up (Spherize), some place we have
two tooltips show up

## Screenshots of UI changes
Before:


![image](https://user-images.githubusercontent.com/31378877/232664920-383f052c-842d-4263-a07c-7fede98101bc.png)

After:

![image](https://user-images.githubusercontent.com/31378877/232665054-045a4995-3982-4b67-b8b8-5e6a3a62a8e6.png)



## Detailed steps to verify changes work correctly (as executed by you)

Hover over tabs and Spherize option, verify things show up as expected

## Alternate designs / implementations considered

Author: alicialics

tensorboard/plugins/projector/vz_projector/vz-projector-data-panel.html.ts

@@ -625,17 +625,22 @@ export const template = html`
       </paper-dialog>
     </div>
     <paper-checkbox id="normalize-data-checkbox" checked="{{normalizeData}}">
-      Sphereize data
-      <paper-icon-button icon="help" class="help-icon"></paper-icon-button>
-      <paper-tooltip
-        position="bottom"
-        animation-delay="0"
-        fit-to-visible-bounds
-      >
-        The data is normalized by shifting each point by the centroid and making
-        it unit norm.
-      </paper-tooltip>
+      Spherize data
     </paper-checkbox>
+    <paper-icon-button
+      id="normalize-data-help"
+      icon="help"
+      class="help-icon"
+    ></paper-icon-button>
+    <paper-tooltip
+      for="normalize-data-help"
+      position="bottom"
+      animation-delay="0"
+      fit-to-visible-bounds
+    >
+      The data is normalized by shifting each point by the centroid and making
+      it unit norm.
+    </paper-tooltip>
     <div class="dirs">
       <table>
         <tr>

tensorboard/plugins/projector/vz_projector/vz-projector-projections-panel.html.ts

@@ -142,42 +142,30 @@ export const template = html`
     <div id="main">
       <div class="ink-panel-header">
         <div class="ink-tab-group">
-          <div data-tab="umap" id="umap-tab" class="ink-tab projection-tab">
+          <div
+            data-tab="umap"
+            id="umap-tab"
+            class="ink-tab projection-tab"
+            title="Uniform manifold approximation and projection"
+          >
             UMAP
           </div>
-          <paper-tooltip
-            for="umap-tab"
-            position="bottom"
-            animation-delay="0"
-            fit-to-visible-bounds
+          <div
+            data-tab="tsne"
+            id="tsne-tab"
+            class="ink-tab projection-tab"
+            title="t-distributed stochastic neighbor embedding"
           >
-            uniform manifold approximation and projection
-          </paper-tooltip>
-
-          <div data-tab="tsne" id="tsne-tab" class="ink-tab projection-tab">
             t-SNE
           </div>
-          <paper-tooltip
-            for="tsne-tab"
-            position="bottom"
-            animation-delay="0"
-            fit-to-visible-bounds
+          <div
+            data-tab="pca"
+            id="pca-tab"
+            class="ink-tab projection-tab"
+            title="Principal component analysis"
           >
-            t-distributed stochastic neighbor embedding
-          </paper-tooltip>
-
-          <div data-tab="pca" id="pca-tab" class="ink-tab projection-tab">
             PCA
           </div>
-          <paper-tooltip
-            for="pca-tab"
-            position="bottom"
-            animation-delay="0"
-            fit-to-visible-bounds
-          >
-            Principal component analysis
-          </paper-tooltip>
-
           <div
             data-tab="custom"
             id="custom-tab"
@@ -186,14 +174,6 @@ export const template = html`
           >
             Custom
           </div>
-          <paper-tooltip
-            for="custom-tab"
-            position="bottom"
-            animation-delay="0"
-            fit-to-visible-bounds
-          >
-            Search for two vectors upon which to project all points.
-          </paper-tooltip>
         </div>
       </div>
       <div class="container">