Remove some stale references to the addopcodes.tcl script from documentation.
FossilOrigin-Name: c0381b0bc90aa3c2415c4b3ac338cfe6d308bb5d4247bc6f2b6e919f549c254c
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drh committed
7bbdc3c59722b6626efbbfe7ad1a23748477403a
Parent: f1722ba