Update Tutorials “introduction-to-cilk-programming”

src/doc/tutorials/introduction-to-cilk-programming.md

@@ -1,6 +1,6 @@
 ---
 layout: layouts/page.njk
-title: Introduction to Cilk programming
+title: Introduction to Cilk programming, Part 1
 tagline: With a few Cilk keywords, OpenCilk extends C/C++ to support fork-join
   parallel programming, a simple and efficient model for writing fast code for
   multicore computers.
@@ -11,7 +11,7 @@ tags:
   - task-parallelism
   - spawn
 ---
-## Task-parallel programming
+## Task-parallel programming with `cilk_spawn` and `cilk_scope`
 
 {% defn "parallel algorithms", "Parallel programming" %} involves writing instructions that can be executed on different processors simultaneously. Compared to serial programming, parallel programming offers opportunities to reduce the resources consumed (e.g., time, storage, energy, etc.), but taking advantage of these opportunities can be exceedingly complicated and error-prone — too much for developers to manage on their own.