[articles/faq] Tweaks (#3903)

Add link to const(FAQ) and remove related items.
Move wiki link to top list.
Use RUNNABLE_EXAMPLE.
Fix typo.

Author: ntrel

articles/faq.dd

@@ -5,8 +5,12 @@ $(D_S $(TITLE),
         $(P The same questions keep cropping up, so the obvious thing to do is
         prepare a FAQ.)
 
-        $(P $(LINK2 http://www.digitalmars.com/d/1.0/faq.html, D 1.0 FAQ))
-        $(P $(LINK2 http://www.digitalmars.com/faq.html, C++ FAQ))
+        $(P See also:)
+
+        * $(DDLINK articles/const-faq, const(FAQ), const(FAQ)) for `const` and `immutable`.
+        * $(LINK2 http://www.prowiki.org/wiki4d/wiki.cgi?FaqRoadmap, The D wiki FAQ page)
+        * $(LINK2 http://www.digitalmars.com/d/1.0/faq.html, D 1.0 FAQ)
+        * $(LINK2 http://www.digitalmars.com/faq.html, C++ FAQ)
 
 $(H2 D 2.0 FAQ)
 
@@ -17,16 +21,6 @@ $(H2 D 2.0 FAQ)
 
         $(LI I suggested a great feature. Why was the suggestion ignored?)
 
-        $(LI Why const and immutable?)
-
-        $(LI Why the $(I names) const and immutable?)
-
-        $(LI How exactly is immutable related to multicores?)
-
-        $(LI Ok, I'm fine with immutable for safe data sharing among threads. But why do we need the uninformative const?)
-
-        $(LI Why are immutable strings favored in D 2.0?)
-
         $(LI I want to contribute to D 2.0. How can I effect that?)
 
         $(ITEMR case_range, Why doesn't the case range statement
@@ -48,9 +42,6 @@ $(H2 D 2.0 FAQ)
 $(H2 General D FAQ)
 
         $(UL
-
-        $(LI $(LINK2 http://www.prowiki.org/wiki4d/wiki.cgi?FaqRoadmap, The D wiki FAQ page)
-        with many more questions answered)
         $(LI $(LINK2 $(ROOT_DIR)comparison.html, What does D have that C++ doesn't?))
         $(ITEMR q1, Why the name D?)
         $(ITEMR q1_1, Could you change the name? D is kind of hard to search for on search engines.)
@@ -365,6 +356,7 @@ $(ITEM real, What is the point of 80 bit reals?)
 
 $(ITEM anonymous, How do I do anonymous struct/unions in D?)
 
+$(RUNNABLE_EXAMPLE
 -----------------------
 import std.stdio;
 
@@ -385,6 +377,7 @@ void main()
         Foo.d.offsetof);
 }
 -----------------------
+)
 
 $(ITEM printf, How do I get printf() to work with strings?)
 
@@ -791,7 +784,7 @@ $(ITEM gc_1, Isn't garbage collection slow and non-deterministic?)
         However, the use of GC instead of malloc enables advanced language
         constructs (especially, more powerful array syntax), which greatly
         reduce the number of memory allocations which need to be made.
-        This can mean that GC is actually faster than explict management.
+        This can mean that GC is actually faster than explicit management.
         )
 
 $(ITEM pure, Can't a sufficiently smart compiler figure out that a function is pure automatically?)