Remove internal details about underline cell APIs

Author: Tyriar

typings/xterm-headless.d.ts

@@ -1219,11 +1219,11 @@ declare module '@xterm/headless' {
     /** Whether the cell has the default attribute (no color or style). */
     isAttributeDefault(): boolean;
 
-    /** Gets the underline style, see {@link UnderlineStyle}. */
+    /** Gets the underline style. */
     getUnderlineStyle(): number;
-    /** Gets the underline color number, following the same rules as foreground colors. */
+    /** Gets the underline color number. */
     getUnderlineColor(): number;
-    /** Gets the underline color mode, see {@link Attributes.CM_DEFAULT} etc. */
+    /** Gets the underline color mode. */
     getUnderlineColorMode(): number;
     /** Whether the cell is using the RGB underline color mode. */
     isUnderlineColorRGB(): boolean;