Further updates to the netstat(1) man page and usage message

- Reformat the entire man page
- Create a proper synopsis section
- Use itemized-lists to describe each flag, rather than paragraphs
- Cross-reference common flags to a 'general flags' sub-section with short
inline description of the flag
- Label 'general flags' sub-section
- Apply additional fixes suggested by wblock, brueffer, and bdrewery
- Update .Dd that got undone previously
- Change the order of the .Op Fl to be alphabetical
- Add the -i | -I interface flags to the description of 'interface
display mode'
- Fix missing parameters in man page
- Fix missing parameters in usage()
- Sync man page and usage()

MFC Note: stable/9 and stable/10 do not have -R, will need to be removed
when merged

CR:		D58
Reviewed by:	brueffer, bcr
Approved by:	wblock (mentor)
MFC after:	7 days
Sponsored by:	ScaleEngine Inc.

usr.bin/netstat/main.c

@@ -828,14 +828,16 @@ usage(void)
 "               [-M core] [-N system]",
 "       netstat -i | -I interface [-46abdhnW] [-f address_family]\n"
 "               [-M core] [-N system]",
-"       netstat -w wait [-I interface] [-46d] [-M core] [-N system] [-q howmany]",
-"       netstat -s [-s] [-46z] [-f protocol_family | -p protocol]\n"
-"               [-M core] [-N system]",
-"       netstat -i | -I interface [-46s] [-f protocol_family | -p protocol]\n"
+"       netstat -w wait [-I interface] [-46d] [-M core] [-N system]\n"
+"               [-q howmany]",
+"       netstat -s [-46sz] [-f protocol_family | -p protocol]\n"
 "               [-M core] [-N system]",
+"       netstat -i | -I interface -s [-46s]\n"
+"               [-f protocol_family | -p protocol] [-M core] [-N system]",
 "       netstat -m [-M core] [-N system]",
-"       netstat -B [-I interface]",
-"       netstat -r [-46AanW] [-f address_family] [-M core] [-N system]",
+"       netstat -B [-z] [-I interface]",
+"       netstat -r [-46AnW] [-F fibnum] [-f address_family]\n"
+"               [-M core] [-N system]",
 "       netstat -rs [-s] [-M core] [-N system]",
 "       netstat -g [-46W] [-f address_family] [-M core] [-N system]",
 "       netstat -gs [-46s] [-f address_family] [-M core] [-N system]",