Update CrashCourseInLua.rst

readthedocs/CrashCourseInLua.rst

@@ -45,25 +45,28 @@ Lua is dynamically typed
 ========================
 This means that values have types but variables do not. Example::
 
-  x = 1 -- x is integer
-  x = 5.0 -- x is now a double
-  x = {} -- x is now an empty table
-  x = function() end -- x is now a function with empty body
+  x = 1 -- x holds an integer
+  x = 5.0 -- x now holds a double
+  x = {} -- x now holds an empty table
+  x = function() end -- x now holds a function with empty body
   
 Variables are global unless declared local
 ==========================================
-In the example above, `x` is global. 
+In the example above, ``x`` is global. 
 But saying::
 
   local x = 1 
   
-makes `x` local, i.e. its scope and visiability is constrained to the enclosing block of code, and any nested blocks. Note that
+makes ``x`` local, i.e. its scope and visiability is constrained to the enclosing block of code, and any nested blocks. Note that
 local variables avoid a lookup in the 'global' table and hence are more efficient. Thus it is common practice to cache values in
-local variable. For example, math.abs() is a function - and following creates a local variable that caches it::
+local variable. For example, ``math.abs()`` is a function - and following creates a local variable that caches it::
 
   local abs = math.abs
   abs(5.5) -- invoked same function as math.abs
   
+  local print = print -- caches global print() function
+  print('hello world!') -- calls the same function as global print()
+