Added more documentation

CHANGELOG.md

src/ast/expressions/ProcedureCall.ts

src/ast/statements/BreakStatement.ts

src/ast/statements/Case.ts

src/ast/statements/ConditionStatement.ts

src/ast/statements/ContinueStatement.ts

src/ast/statements/DoStatement.ts

src/ast/statements/ForInit.ts

src/ast/statements/ForStatement.ts

src/ast/statements/IfStatement.ts

src/ast/statements/PrimitiveStatement.ts

src/ast/statements/PrintStatement.ts

src/ast/statements/ReturnStatement.ts

src/ast/statements/SelectStatement.ts

src/ast/statements/StatementBlock.ts

src/ast/statements/StatementExpression.ts

src/ast/statements/StatementWrapper.ts

src/ast/statements/WhileStatement.ts

src/ast/typeNodes/ArrayTypeNode.ts

src/ast/typeNodes/ChannelTypeNode.ts