Avoid giving the impression of a complete list.

Listing everything in the abstract would get too long to really be
useful for the reader.  Instead of trying to add what's omitted
(conditional operator, range operators, nil-coalescing operator, maybe
others) make it clear that these are examples.

Author: amartini51

Sources/TSPL/TSPL.docc/LanguageGuide/BasicOperators.md

@@ -1,6 +1,6 @@
 # Basic Operators
 
-Perform assignment, arithmetic, comparison, and Boolean operations.
+Perform operations like assignment, arithmetic, and comparison.
 
 An *operator* is a special symbol or phrase that you use to
 check, change, or combine values.