docs(Chip): Update the data type for chip component border-radius from Color to String

Closes #5676

Signed-off-by: MPopov <desig9stein@gmail.com>

Author: MPopov

projects/igniteui-angular/src/lib/core/styles/components/chip/_chip-theme.scss

@@ -6,7 +6,7 @@
 
 /// Chip Theme
 /// @param {Map} $palette [$default-palette] - The palette used as basis for styling the component.
-/// @param {Color} $border-radius [null] - The chip border-radius.
+/// @param {String} $border-radius [null] - The chip border-radius.
 ///
 /// @param {Color} $text-color [null] - The chip text color.
 /// @param {Color} $background [null] - The chip background color.