CLEANUP: tree-wide: remove a few rare non-ASCII chars

As reported by Tim in issue #1428, our sources are clean, there are
just a few files with a few rare non-ASCII chars for the paragraph
symbol, a few typos, or in Fred's name. Given that Fred already uses
the non-accentuated form at other places like on the public list,
let's uniformize all this and make sure the code displays equally
everywhere.
diff --git a/src/cbuf.c b/src/cbuf.c
index f719435..46f12a3 100644
--- a/src/cbuf.c
+++ b/src/cbuf.c
@@ -1,7 +1,7 @@
 /*
  * Circular buffer management
  *
- * Copyright 2021 HAProxy Technologies, Frédéric Lécaille <flecaill@haproxy.com>
+ * Copyright 2021 HAProxy Technologies, Frederic Lecaille <flecaill@haproxy.com>
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public