Fixed typos for some nsedoc tag names:

INFO processing file `nselib/datafiles.lua'
ERROR undefined handler for tag `type'
INFO processing file `nselib/dns.lua'
ERROR undefined handler for tag `result'
ERROR undefined handler for tag `result'
INFO processing file `nselib/netbios.lua'
ERROR undefined handler for tag `returns'
INFO processing file `nselib/snmp.lua'
ERROR undefined handler for tag `result'
INFO processing file `scripts/SSLv2-support.nse'
ERROR undefined handler for tag `ouput'

Removed a @see tag which refers to Lua's string.format rather than to NSE docs:
INFO generating file `docs/modules/stdnse.html'
ERROR unresolved reference to symbol `string.format'

scripts/SSLv2-support.nse

@@ -5,7 +5,7 @@ offers.
 ]]
 
 ---
---@ouput
+--@output
 -- 443/tcp open   https   syn-ack\n
 -- |  SSLv2: server still supports SSLv2\n
 -- |       SSL2_RC4_128_WITH_MD5\n