nimsuggest: bugfix: also output documentation comments

tools/nimsuggest/tests/tstrutils.nim

@@ -1,7 +1,7 @@
 discard """
 $nimsuggest --tester lib/pure/strutils.nim
 >def lib/pure/strutils.nim:2300:6
-def;;skTemplate;;system.doAssert;;proc (cond: bool, msg: string): typed;;*/lib/system.nim;;*;;9;;"";;100
+def;;skTemplate;;system.doAssert;;proc (cond: bool, msg: string): typed;;*/lib/system.nim;;*;;9;;"same as `assert` but is always turned on and not affected by the\x0A``--assertions`` command line switch.";;100
 """
 
 # Line 2300 in strutils.nim is doAssert and this is unlikely to change