Make the default text for RST more descriptive.

snippets/rst.snippets

@@ -1,14 +1,14 @@
 # rst
 
 snippet :
-	:${1:Text}: ${2:blah blah}
+	:${1:field name}: ${2:field body}
 snippet *
 	*${1:Emphasis}*
 snippet **
 	**${1:Strong emphasis}**
 snippet _
-	\`${1:Text}\`_
+	\`${1:hyperlink-name}\`_
-	.. _\`$1\`: ${2:blah blah}
+	.. _\`$1\`: ${2:link-block}
 snippet =
 	${1:Title}
 	=====${2:=}