[coq] Untabify the whole ML codebase.

We also remove trailing whitespace.

Script used:

```bash
for i in `find . -name '*.ml' -or -name '*.mli' -or -name '*.mlg'`; do expand -i "$i" | sponge "$i"; sed -e's/[[:space:]]*$//' -i.bak "$i"; done
```

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/util.mli b/lib/util.mli
index b6347126e0..2f1a03a19c 100644
--- a/lib/util.mli
+++ b/lib/util.mli
@@ -94,7 +94,7 @@ val matrix_transpose : 'a list list -> 'a list list
 val identity : 'a -> 'a
 
 (** Left-to-right function composition:
-    
+
     [f1 %> f2] is [fun x -> f2 (f1 x)].
 
     [f1 %> f2 %> f3] is [fun x -> f3 (f2 (f1 x))].