Fix docs typos for zeroize related features/test
diff --git a/programs/test/zeroize.c b/programs/test/zeroize.c
index a7b94e2..9f77425 100644
--- a/programs/test/zeroize.c
+++ b/programs/test/zeroize.c
@@ -1,7 +1,7 @@
/*
* Zeroize application for debugger-driven testing
*
- * This is a simple test application used for debbuger-driven testing to check
+ * This is a simple test application used for debugger-driven testing to check
* whether calls to mbedtls_zeroize() are being eliminated by compiler
* optimizations. This application is used by the GDB script at
* tests/scripts/test_zeroize.gdb under the assumption that line numbers do not
