changes.src: Fix misprint in "instructions" word.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
diff --git a/doc/changes.src b/doc/changes.src
index 5f8cb2e..43a4997 100644
--- a/doc/changes.src
+++ b/doc/changes.src
@@ -13,7 +13,7 @@
 
 \b Fixed NULL dereference if environment variable is missed.
 
-\b Updates of new AVX v7 Intel instruciotns.
+\b Updates of new AVX v7 Intel instructions.
 
 \b \c{PUSH imm32} is now officially documented.