Add more info on whitespace-mode and wrap prefix

The problem does not come from  adaptive-wrap per se.  For some reason
whitespace-mode does  not act on  spaces in display  properties (which
csv-mode  uses)  but  it  does  act on  spaces  from  line-prefix  and
wrap-prefix.

Interestingly,   whitespace-mode   only    replaces   the   characters
in *-prefix; it does not set their face, which remains 'default.

1 files changed, 1 insertions, 1 deletions

diff --git a/index.md b/index.md
index 66d9fca..4cc561d 100644
--- a/index.md
+++ b/index.md
@@ -1,5 +1,5 @@
 # Peniblec's Memory Leaks
-## still reachable: 2456 words in 3 pages
+## still reachable: 2453 words in 3 pages
 
 Hi!  I am a software engineer interested in [a bunch of things].