Merge pull request #1080 from kryzhovnik/bash/clear-variable-default-value

Clear explanation of default value expression

bash.html.markdown

@@ -65,7 +65,8 @@ echo ${VARIABLE:0:LENGTH}
 
 # Default value for variable
 echo ${FOO:-"DefaultValueIfFOOIsMissingOrEmpty"}
-# This works for null (FOO=), empty string (FOO=""), zero (FOO=0) returns 0
+# This works for null (FOO=) and empty string (FOO=""); zero (FOO=0) returns 0.
+# Note that it only returns default value and doesn't change variable value.
 
 # Builtin variables:
 # There are some useful builtin variables, like