Fix typos

Co-authored-by: Tom Cosgrove <81633263+tom-cosgrove-arm@users.noreply.github.com>
Co-authored-by: Werner Lewis <Werner.Lewis@arm.com>

Signed-off-by: Janos Follath <janos.follath@arm.com>
diff --git a/library/bignum_core.c b/library/bignum_core.c
index 9d1e29c..68c49df 100644
--- a/library/bignum_core.c
+++ b/library/bignum_core.c
@@ -229,7 +229,7 @@
     {
         bytes_to_copy = output_length;
 
-        /* The output outputfer is smaller than the allocated size of A.
+        /* The output buffer is smaller than the allocated size of A.
          * However A may fit if its leading bytes are zero. */
         for( size_t i = bytes_to_copy; i < stored_bytes; i++ )
         {
@@ -263,7 +263,7 @@
 
     if( stored_bytes < output_length )
     {
-        /* There is enough space in the output outputfer. Write initial
+        /* There is enough space in the output buffer. Write initial
          * null bytes and record the position at which to start
          * writing the significant bytes. In this case, the execution
          * trace of this function does not depend on the value of the
@@ -274,7 +274,7 @@
     }
     else
     {
-        /* The output outputfer is smaller than the allocated size of X.
+        /* The output buffer is smaller than the allocated size of X.
          * However X may fit if its leading bytes are zero. */
         bytes_to_copy = output_length;
         p = output;