Fix typos in documentation and constants with typo finding tool

Signed-off-by: bootstrap-prime <bootstrap.prime@gmail.com>
diff --git a/library/ecdh.c b/library/ecdh.c
index 9dfa868..60c6e42 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -399,7 +399,7 @@
 }
 
 /*
- * Read the ServerKeyExhange parameters (RFC 4492)
+ * Read the ServerKeyExchange parameters (RFC 4492)
  *      struct {
  *          ECParameters    curve_params;
  *          ECPoint         public;