[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/library/nametab.mli b/library/nametab.mli
index 55458fe2c6..d603bd51e2 100644
--- a/library/nametab.mli
+++ b/library/nametab.mli
@@ -100,7 +100,7 @@ val error_global_not_found : qualid -> 'a
    object is loaded inside a module -- or
    - for a precise suffix, when the module containing (the module
    containing ...) the object is opened (imported)
-   
+
 *)
 
 type visibility = Until of int | Exactly of int