SMART — OP-Code for file operations

It is unclear if the OP-Code uses the upper or the lower 2 bits in Section 2.3.2
“File Operations”. Since using the lower 2 Bits make calculations of addresses
more easy the following changes are proposed:
“Together with the 64 file names (6 bits) (which an ST can hold), the file
operation and the file name can be fitted into a single byte.“
should be changed to
“Since an ST can hold up to 64 files, the file name (6 upper bits) and the file
operation (2 lower bits) can be fitted into a single byte.“
In addition the description of the MS-Round in Section 2.3.3 should be changed
to “… <file name | operation > …”

Accept changes as proposed.