Grammar police: "its", not "it's", is the possessive form of "it".

lib/libc/sys/getsid.2

@@ -75,5 +75,5 @@ function call appeared in
 .Fx 3.0 .
 The
 .Fn getsid
-function call is derived from it's usage in
+function call is derived from its usage in
 .At V .

lib/libc/sys/issetugid.2

@@ -56,7 +56,7 @@ and returns 0 otherwise.
 A process is tainted if it was created as a result of an
 .Xr execve 2
 system call which had either of the setuid or setgid bits set (and extra
-privileges were given as a result) or if it has changed any of it's real,
+privileges were given as a result) or if it has changed any of its real,
 effective or saved user or group ID's since it began execution.
 .Pp
 This system call exists so that library routines (eg: libc, libtermcap)

lib/libfetch/fetch.3

@@ -201,7 +201,7 @@ in the appropriate section below.
 .Pp
 .Fn fetchStatURL
 attempts to obtain the requested document's metadata and fill in the
-structure pointed to by it's second argument.
+structure pointed to by its second argument.
 The
 .Fa url_stat
 structure is defined as follows in

share/man/man4/ch.4

@@ -173,7 +173,7 @@ the jukebox before using the \fBCHIGSTATUS\fR
 ioctl to query the jukebox' status.
 .It Dv CHIOIELEM
 Perform the \fBINITIALIZE ELEMENT STATUS\fR call on the media changer
-device.  This forces the media changer to update it's internal status
+device.  This forces the media changer to update its internal status
 information with respect to loaded media.  It also scans any barcode
 labels provided that it has a label reader.  The 
 .Nm

share/man/man4/netgraph.4

@@ -351,13 +351,13 @@ Some nodes (usually associated with a piece of hardware) may be
 .Em persistent
 in that a shutdown breaks all edges and resets the node,
 but doesn't remove it. In this case the shutdown method should not
-free it's resources, but rather, clean up and then clear the
+free its resources, but rather, clean up and then clear the
 .Em NG_INVALID
 flag to signal the generic code that the shutdown is aborted. In
 the case where the shutdown is started by the node itself due to hardware
 removal or unloading, (via ng_rmnode_self()) it should set the
 .Em NG_REALLY_DIE
-flag to signal to it's own shutdown method that it is not to persist.
+flag to signal to its own shutdown method that it is not to persist.
 .El
 .Sh Sending and Receiving Data
 Two other methods are also supported by all nodes:
@@ -427,7 +427,7 @@ The infrastructure will respect that bit and queue the data for delivery at
 a later time, rather than deliver it directly. A node may decide to set
 the bit on the
 .Em peer
-node, so that it's own output packets are queued. This is used
+node, so that its own output packets are queued. This is used
 by device drivers running at different processor priorities to transfer
 packet delivery to the splnet() level at which the bulk of
 .Nm

share/man/man4/si.4

@@ -49,7 +49,7 @@ or jumper MUST be set for 8 bit mode.
 The ISA adapters can use Irq's 11, 12 or 15 (and 9 and 10 in the case of
 SX host cards).
 .Pp
-The si device driver may have some of it's configuration settings changed
+The si device driver may have some of its configuration settings changed
 at run-time with the
 .Xr sicontrol 8
 utility.

share/man/man9/pfil.9

@@ -59,7 +59,7 @@ routines.  The
 function returns the first member of a particular hook, either the in or out
 list.  The
 .Fn pfil_add_hook
-function takes a function of the form below as it's first argument, and the
+function takes a function of the form below as its first argument, and the
 flags for which lists to add the function to.  The possible values for these
 flags are some combination of PFIL_IN and PFIL_OUT.  The
 .Fn pfil_remove_hook

usr.bin/gprof/gprof.1

@@ -61,7 +61,7 @@ that are compiled for profiling.
 .Nm Gprof
 reads the given object file (the default is
 .Pa a.out)
-and establishes the relation between it's symbol table
+and establishes the relation between its symbol table
 and the call graph profile.
 The default graph profile file name is the name
 of the executable with the suffix

usr.sbin/periodic/periodic.8

@@ -73,12 +73,12 @@ If a file does not have the executable bit set,  it is silently ignored.
 Each script is required to exit with one of the following values:
 .Bl -tag -width XXXX
 .It 0
-The script has produced nothing notable in it's output.
+The script has produced nothing notable in its output.
 The
 .Va <basedir>_show_success
 variable controls the masking of this output.
 .It 1
-The script has produced some notable information in it's output.
+The script has produced some notable information in its output.
 The
 .Va <basedir>_show_info
 variable controls the masking of this output.