all: fix typos in comments

Fix its/it's, who's/whose, wether/whether, missing apostrophes
in contractions, and other misspellings across the codebase.

Updates #cleanup

Change-Id: I20453b81a7aceaa14ea2a551abba08a2e7f0a1d8
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

tstest/natlab/vnet/conf.go

@@ -349,7 +349,7 @@ func (n *Network) SetBlackholedIPv4(v bool) {
 	n.breakWAN4 = v
 }
 
-// SetPostConnectControlBlackhole sets wether the network should blackhole all
+// SetPostConnectControlBlackhole sets whether the network should blackhole all
 // traffic to the control server after the clients have connected.
 func (n *Network) SetPostConnectControlBlackhole(v bool) {
 	n.postConnectBlackholeControl = v

tstest/natlab/vnet/vnet.go

@@ -579,7 +579,7 @@ func (n *network) MACOfIP(ip netip.Addr) (_ MAC, ok bool) {
 	return MAC{}, false
 }
 
-// SetControlBlackholed sets wether traffic to control should be blackholed for the
+// SetControlBlackholed sets whether traffic to control should be blackholed for the
 // network.
 func (n *network) SetControlBlackholed(v bool) {
 	n.blackholeControl = v