bug fix in .htaccess

Author: LandauRaz

.htaccess

@@ -419,4 +419,4 @@ RewriteRule ^architecture-and-concepts/smart-contracts/class-hash/$ https://book
 RewriteRule ^architecture-and-concepts/smart-contracts/contract-classes/$ https://book.cairo-lang.org/ch100-01-contracts-classes-and-instances.html [R=301,L]
 RewriteRule ^architecture-and-concepts/smart-contracts/cairo-and-sierra/$ https://book.cairo-lang.org/appendix-09-sierra.html [R=301,L]
 RewriteRule ^architecture-and-concepts/smart-contracts/serialization-of-cairo-types/$ https://book.cairo-lang.org/ch102-04-serialization-of-cairo-types.html [R=301,L]
-RewriteRule ^architecture-and-concepts/(.*)$ architecture/$1 [R=301,L]
+RewriteRule ^architecture-and-concepts/(.*)$ /architecture/$1 [R=301,L]