TextTruncate example and SplitWord documented (#950)

Added missing documentation and examples to Enum.TextTruncate

## Changes

<!-- Please summarize your changes. -->

<!-- Please link to any applicable information (forum posts, bug
reports, etc.). -->

None:
<img width="246" alt="image"
src="https://github.com/user-attachments/assets/abb15a94-eaf3-4fae-a88f-3599665f1691"
/>

AtEnd:
<img width="246" alt="image"
src="https://github.com/user-attachments/assets/50028bf2-2d74-4214-a6ab-c50d4e0a417b"
/>

SplitWord:
<img width="236" alt="image"
src="https://github.com/user-attachments/assets/efea0f80-0897-4e4d-9887-eebc1395cdf9"
/>


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Author: gordody-roblox

content/en-us/reference/engine/enums/TextTruncate.yaml

@@ -17,12 +17,32 @@ items:
   - name: AtEnd
     summary: |
       Text is truncated at the end of the text; extra graphemes that cannot fit
-      into the space are replaced with `...`.
+      into the space are replaced with `...`. Word boundaries are respected if
+      possible.
+
+      For example, if the control is between -> and <- like so:
+
+      `->Long text is truncated at the en<-d of the last complete word`
+
+      The text will be:
+
+      `Long text is truncated at the...`
     value: 1
     tags: []
     deprecation_message: ''
   - name: SplitWord
-    summary: ''
+    summary: |
+      If the end of the line occurs in the middle of a word, the text is
+      truncated inside of that word. Extra graphemes that cannot fit into the
+      space are replaced with `...`.
+
+      For example, if the control is between -> and <- like so:
+
+      `->Long text is truncated at the en<-d of the last complete word`
+
+      The text will be:
+
+      `Long text is truncated at the en...`
     value: 2
     tags: []
     deprecation_message: ''