add snippet descriptions

UltiSnips/tex.snippets

@@ -8,7 +8,7 @@ snippet "b(egin)?" "begin{} / end{}" br
 \end{$1}
 endsnippet
 
-snippet tab
+snippet tab "tabular / array environment"
 \begin{${1:t}${1/(t)$|(a)$|(.*)/(?1:abular)(?2:rray)/}}{${2:c}}
 $0${2/((?<=.)c|l|r)|./(?1: & )/g}
 \end{$1${1/(t)$|(a)$|(.*)/(?1:abular)(?2:rray)/}}

UltiSnips/vim.snippets

@@ -9,14 +9,14 @@ if !exists("g:${1:MyUltraImportantVar}")
 endif
 endsnippet
 
-snippet guard
+snippet guard "script reload guard"
 if exists('${1:did_`!p snip.rv = snip.fn.replace('.','_')`}') || &cp${2: || version < 700}
 	finish
 endif
 let $1 = 1${3}
 endsnippet
 
-snippet f
+snippet f function
 fun ${1:function_name}(${2})
 	${3:" code}
 endf