#1744 - Add vanish and specVanish

docs/usage/text.md

@@ -151,6 +151,28 @@ const text = new TextRun({
 });
 ```
 
+### Vanish and SpecVanish
+
+You may want to hide your text in your document.
+
+`Vanish` should affect the normal display of text, but an application may have settings to force hidden text to be displayed.
+
+```ts
+const text = new TextRun({
+    text: "This text will be hidden",
+    vanish: true,
+});
+```
+
+`SpecVanish` was typically used to ensure that a paragraph style can be applied to a part of a paragraph, and still appear as in the Table of Contents (which in previous word processors would ignore the use of the style if it were being used as a character style).
+
+```ts
+const text = new TextRun({
+    text: "This text will be hidden forever.",
+    specVanish: true,
+});
+```
+
 ## Break
 
 Sometimes you would want to put text underneath another line of text but inside the same paragraph.