Add missing comments to FullContextParsing tests

antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/FullContextParsing/FullContextIF_THEN_ELSEParse_2.stg

@@ -7,6 +7,13 @@ Decision 1:
 s0-'else'->:s1^=>1<\n>
 >>
 
+// Technically, this input sequence is not ambiguous because else
+// uniquely predicts going into the optional subrule. else cannot
+// be matched by exiting stat since that would only match '}' or
+// the start of a stat. But, we are using the theory that
+// SLL(1)=LL(1) and so we are avoiding full context parsing
+// by declaring all else clause parsing to be ambiguous.
+
 Errors() ::= <<
 line 1:19 reportAttemptingFullContext d=1 (stat), input='else'
 line 1:19 reportContextSensitivity d=1 (stat), input='else'<\n>

antlr4-testgen-maven-plugin/resources/org/antlr4/runtime/test/templates/FullContextParsing/LoopsSimulateTailRecursion.stg

@@ -1,3 +1,7 @@
+/*
+ * Tests predictions for the following case involving closures.
+ * http://www.antlr.org/wiki/display/~admin/2011/12/29/Flaw+in+ANTLR+v3+LL(*)+analysis+algorithm
+ */
 TestType() ::= "Parser"
 
 Options ::= [