Fix typo

Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
diff --git a/docs/3.0-migration-guide.md b/docs/3.0-migration-guide.md
index 35652c3..081e7bb 100644
--- a/docs/3.0-migration-guide.md
+++ b/docs/3.0-migration-guide.md
@@ -135,7 +135,7 @@
 ## Low-level crypto
 
 Please also refer to the section [High-level crypto](#high-level-crypto) for
-changes that could sit in either cateogry.
+changes that could sit in either category.
 
 ### The RNG parameter is now mandatory for all functions that accept one
 
@@ -244,7 +244,7 @@
 ## High-level crypto
 
 Please also refer to the section [Low-level crypto](#low-level-crypto) for
-changes that could sit in either cateogry.
+changes that could sit in either category.
 
 ### Remove wrapper for libpkcs11-helper