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twsi(3): fix wrong unicode codepoint in manpage

--- a/sys/man/3/twsi

+++ b/sys/man/3/twsi

@@ -1,14 +1,14 @@

 .TH TWSI 3 

 .SH NAME

-twsi - two-wire serial interface (TWSI) and inter-integrated circuit (I⁲C) interface

+twsi - two-wire serial interface (TWSI) and inter-integrated circuit (I²C) interface

 .SH SYNOPSIS

-.B bind -a #⁲ /dev

+.B bind -a #² /dev

 .sp 0.3v

 .B /dev/twsi*

 .SH DESCRIPTION

 The

 .I twsi

-device serves a one-level directory containing one file per TWSI or I⁲C bus.

+device serves a one-level directory containing one file per TWSI or I²C bus.

 Bytes written are transmitted on the bus;

 bytes received from the bus are queued and delivered by reading.

 Seeking to a given offset before reading or writing causes the

@@ -19,7 +19,7 @@

 .IR write

 call.

 .SH FILES

-.B #⁲/twsi*

+.B #²/twsi*

 .SH SOURCE

 .B /sys/src/9/*/devtwsi.c

 .SH BUGS