Update programs_and_modules.bal

examples/programs-and-modules/programs_and_modules.bal

@@ -1,11 +1,11 @@
-// This import declaration binds the prefix `io` to the `ballerina/io` module. 
-// The prefix by default comes form the last part of the module name.
-// The `ballerina` org name is reserved for the Ballerina library modules.
+// This import declaration binds the prefix `io` to the `ballerina/io` package. 
+// The prefix by default comes from the last part of the package name.
+// The `ballerina` org name is reserved for the Ballerina library packages.
 import ballerina/io;
 
 // `main` function is the program entry point. 
-// `public` makes function visible outside the module.
+// `public` makes the function visible outside the package.
 public function main() {
-    // Here `io:println` means function `println` is in the module bound to prefix `io`.
+    // Here `io:println` means function `println` is in the package bound to prefix `io`.
     io:println("Hello, World!");
 }