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as/x86: Add references to ins.c

These references are usually basic to be able to understand
the source code.

--- a/src/cmd/as/target/x86/ins.c

+++ b/src/cmd/as/target/x86/ins.c

@@ -8,6 +8,13 @@

 #define addrbyte(mod, reg, rm) ((mod) << 6 | (reg) << 3 | (rm))

+/*

+ * This implementation is based in:

+ *	- x86 Opcode Structure and Instruction Overview - Fraunhofer-Institut

+ *        fÜr kommunikation, informationsverarbeitung und ergonomie fkie.

+ *	- Intel® 64 and IA-32 Architectures Software Developer’s Manual.

+ *	- Encoding Real x86 Instructions - CIS-77 lectures.

+ */

 enum addr_mode {

 	MEM_MODE   = 0,

 	MEM8_MODE  = 1,