utils/readme.txt: Fix typo "get-developers"

Fix typo on line 23 `get-developpers` to `get-developers`

Signed-off-by: Jesse Taube <Mr.Bossman075@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit b58e2cde5ccc955eb02f627688f49cc7af5f23a1)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

utils/readme.txt

@@ -20,7 +20,7 @@ genrandconfig
     (http://autobuild.buildroot.org). It selects a random toolchain from
     support/config-fragments/autobuild and randomly selects packages to build.
 
-get-developpers
+get-developers
     a script to return the list of people interested in a specific part
     of Buildroot, so they can be Cc:ed on a mail. Accepts a patch as
     input, a package name or and architecture name.