Fix typo in configs/README.txt file

Fix typo in Readme file: ajust->adjust
diff --git a/configs/README.txt b/configs/README.txt
index 4a0074c..76f0031 100644
--- a/configs/README.txt
+++ b/configs/README.txt
@@ -8,7 +8,7 @@
 them, you can pick one of the following methods:
 
 1. Replace the default file include/polarssl/config.h with the chosen one.
-   (Depending on your compiler, you may need to ajust the line with
+   (Depending on your compiler, you may need to adjust the line with
    #include "polarssl/check_config.h" then.)
 
 2. Define POLARSSL_CONFIG_FILE and adjust the include path accordingly.