share/man/man9/pwmbus.9 fix types in arguments

[oskar.holmlund_ohdata.se]

Summary

Fix the types of period and duty in share/man/man9/pwmbus.9 to match the one in sys/dev/pmw/pwmbus.c.

[rpokala]

share/man/man9/pwmbus.9

43

The code in pwmbus.c has u_int for channel for all of these...

45

channel isn't an argument for this function.

[oskar.holmlund_ohdata.se]

pwmbus.9
change type for argument channel and the pointer nchannel (int -> u_int)

pwmbus_if.m:

• argument name dev -> bus
• use u_int instead of unsigned int.

[oskar.holmlund_ohdata.se]

rpokala: Thank you for your comments.

[rpokala]

LGTM. Remember to bump .Dd when you commit.