Fix Punctuation in Docs

doc/user/howto_build.md

@@ -43,7 +43,7 @@ To see if everything went well and Suggestible runs you can try running it throu
 ```sh
 cargo run --release
 ```
-For further intructions on how to use Suggestible in your production setting refer to our [usage how-to](howto_basic.md)
+For further intructions on how to use Suggestible in your production setting refer to our [usage how-to](howto_basic.md).
 
 ## Building the Documentation