ada: Tweak documentation comments
The concept of extended nodes was retired at the same time Gen_IL
was introduced, but there was a reference to that concept left over
in a comment. This patch removes that reference.
Also, the description of the field Comes_From_Check_Or_Contract was
incorrectly placed in a section for fields present in all nodes in
sinfo.ads. This patch fixes this.
gcc/ada/
* atree.ads, nlists.ads, types.ads: Remove references to extended
nodes. Fix typo.
* sinfo.ads: Likewise and fix position of
Comes_From_Check_Or_Contract description.
- [DBH] gcc/ada/atree.ads
- [DBH] gcc/ada/nlists.ads
- [DBH] gcc/ada/sinfo.ads
- [DBH] gcc/ada/types.ads