Update release notes for 1.26.0 and set its date to March 21st 2022

doc/chm/VeraCrypt.hhc

@@ -175,8 +175,8 @@
 		</OBJECT>
 	<UL>
 		<LI> <OBJECT type="text/sitemap">
-			<param name="Name" value="RIPEMD-160">
-			<param name="Local" value="RIPEMD-160.html">
+			<param name="Name" value="BLAKE2s-256">
+			<param name="Local" value="BLAKE2s-256.html">
 			</OBJECT>
 		<LI> <OBJECT type="text/sitemap">
 			<param name="Name" value="SHA-256">

doc/chm/VeraCrypt.hhp

@@ -44,6 +44,7 @@ Beginner's Tutorial_Image_022.jpg
 Beginner's Tutorial_Image_023.gif
 Beginner's Tutorial_Image_024.gif
 Beginner's Tutorial_Image_034.png
+BLAKE2s-256.html
 Camellia.html
 Cascades.html
 Changing Passwords and Keyfiles.html
@@ -141,7 +142,6 @@ References.html
 Release Notes.html
 Removable Medium Volume.html
 Removing Encryption.html
-RIPEMD-160.html
 Security Model.html
 Security Requirements and Precautions.html
 Security Requirements for Hidden Volumes.html