Add link to PROGMEM page from Serial.print()'s mention of F()

Author: per1234

Language/Functions/Communication/Serial/print.adoc

@@ -31,7 +31,7 @@ An optional second parameter specifies the base (format) to use; permitted value
 * `Serial.println(1.23456, 2) gives "1.23"` +
 * `Serial.println(1.23456, 4) gives "1.2346"`
 
-You can pass flash-memory based strings to Serial.print() by wrapping them with F(). For example:
+You can pass flash-memory based strings to Serial.print() by wrapping them with link:../../../../variables/utilities/progmem[F()]. For example:
 
 `Serial.print(F(“Hello World”))`