fixup Rename fieldref to clearer and lint-correct name

Author: thk123

jbmc/src/java_bytecode/java_bytecode_convert_method.cpp

@@ -650,8 +650,8 @@ static irep_idt get_if_cmp_operator(const irep_idt &stmt)
 /// Build a member exprt for accessing a specific field that may come from a
 /// base class.
 /// \param pointer: The expression to access the field on.
-/// \param field_reference: A getfield/setfield instruction produced by the bytecode
-///   parser.
+/// \param field_reference: A getfield/setfield instruction produced by the
+///   bytecode parser.
 /// \param ns: Global namespace
 /// \return A member expression accessing the field, through base class
 ///   components if necessary.