Fix typo trap table

[BEforlin]

Small fix on Table 77. NEORV32 Trap Description of the datasheet. TRAP_CODE_S_ACCESS description mentioned errors during loads and vice versa for the TRAP_CODE_L_ACCESS.

Originally:

| `TRAP_CODE_S_ACCESS`     | bus timeout, bus access error or <<_smpmp_isa_extension,PMP>> rule violation during load data operation
| `TRAP_CODE_L_ACCESS`     | bus timeout, bus access error or <<_smpmp_isa_extension,PMP>> rule violation during store data operation

Fix:

| `TRAP_CODE_L_ACCESS`     | bus timeout, bus access error or <<_smpmp_isa_extension,PMP>> rule violation during load data operation
| `TRAP_CODE_S_ACCESS`     | bus timeout, bus access error or <<_smpmp_isa_extension,PMP>> rule violation during store data operation

[stnolting]

Thanks for fixing!