misspellings fixes by https://github.com/vlajos/misspell_fixer

demos/certs/apps/apps.cnf

diff --git a/demos/certs/apps/apps.cnf b/demos/certs/apps/apps.cnf
index a5da216..531afe6 100644
--- a/demos/certs/apps/apps.cnf
+++ b/demos/certs/apps/apps.cnf
@@ -15,7 +15,7 @@
 # Don't prompt for fields: use those in section directly
 prompt			= no
 distinguished_name	= req_distinguished_name
-x509_extensions	= v3_ca	# The extentions to add to the self signed cert
+x509_extensions	= v3_ca	# The extensions to add to the self signed cert
 string_mask = utf8only
 
 # req_extensions = v3_req # The extensions to add to a certificate request

demos/certs/ca.cnf

diff --git a/demos/certs/ca.cnf b/demos/certs/ca.cnf
index c45fcfd..5a8a5f2 100644
--- a/demos/certs/ca.cnf
+++ b/demos/certs/ca.cnf
@@ -16,7 +16,7 @@
 # Don't prompt for fields: use those in section directly
 prompt			= no
 distinguished_name	= req_distinguished_name
-x509_extensions	= v3_ca	# The extentions to add to the self signed cert
+x509_extensions	= v3_ca	# The extensions to add to the self signed cert
 string_mask = utf8only
 
 # req_extensions = v3_req # The extensions to add to a certificate request

demos/easy_tls/easy-tls.c

diff --git a/demos/easy_tls/easy-tls.c b/demos/easy_tls/easy-tls.c
index 9cd8314..864017d 100644
--- a/demos/easy_tls/easy-tls.c
+++ b/demos/easy_tls/easy-tls.c
@@ -971,7 +971,7 @@
     
     /* loop finishes as soon as we detect that one side closed;
      * when all (program and OS) buffers have enough space,
-     * the data from the last succesful read in each direction is transferred
+     * the data from the last successful read in each direction is transferred
      * before close */
     do {
 	int clear_read_select = 0, clear_write_select = 0,

demos/engines/zencod/hw_zencod.h

diff --git a/demos/engines/zencod/hw_zencod.h b/demos/engines/zencod/hw_zencod.h
index 415c9a6..2b1b8fa 100644
--- a/demos/engines/zencod/hw_zencod.h
+++ b/demos/engines/zencod/hw_zencod.h
@@ -135,7 +135,7 @@
 /* key : rc4 key data */
 /* index_1 : value of index x from RC4 key structure */
 /* index_2 : value of index y from RC4 key structure */
-/* Be carefull : RC4 key should be expanded before calling this method (Should we provide an expand function ??) */
+/* Be careful : RC4 key should be expanded before calling this method (Should we provide an expand function ??) */
 typedef int t_zencod_rc4_cipher ( KEY *output, const KEY *input, const KEY *key,
 		unsigned char *index_1, unsigned char *index_2, int mode ) ;
 
@@ -146,7 +146,7 @@
 /* key_3 : des third key data */
 /* iv : initial vector */
 /* mode : xdes mode (encrypt or decrypt) */
-/* Be carefull : In DES mode key_1 = key_2 = key_3 (as far as i can see !!) */
+/* Be careful : In DES mode key_1 = key_2 = key_3 (as far as i can see !!) */
 typedef int t_zencod_xdes_cipher ( KEY *output, const KEY *input, const KEY *key_1,
 		const KEY *key_2, const KEY *key_3, const KEY *iv, int mode ) ;