[epiphany] Update CONTRIBUTING.md

[Michael Catanzaro <mcatanzaro src gnome org>]

commit ccc775bdeaced2d4ac3a86fe58fbffa5c6bbf267
Author: Michael Catanzaro <mcatanzaro posteo net>
Date:   Sun Aug 5 00:33:42 2018 +0000

    Update CONTRIBUTING.md
    
    Add some missing whitespace.

 CONTRIBUTING.md | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index ed5d1547a..4cc22a5e0 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -245,11 +245,11 @@ Possible value for `EPHY_DEBUG_BREAK` variable:
        stack           Prints a stack trace.
 
        suspend         Use this to stop execution when a warning occurs.
-                       You can then attach a debugger to the process.
+                You can then attach a debugger to the process.
 
        trap            Use this while running epiphany in a debugger.
-                       This makes execution stop and gives back control to
-                       the debugger.
+                This makes execution stop and gives back control to
+                the debugger.
 ```
 
 ### Profiling