DOC/MINOR: config: Fix typo in description for `ssl_bc` in configuration.txt

Fix a minor typo in the description of the `ssl_bc` sample fetch method described under
Section `7.3.4. Fetching samples at Layer 5` in configuration.txt. Changed `other` to `to`.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 8246356..7a26fe3 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -20628,7 +20628,7 @@
 ssl_bc : boolean
   Returns true when the back connection was made via an SSL/TLS transport
   layer and is locally deciphered. This means the outgoing connection was made
-  other a server with the "ssl" option. It can be used in a tcp-check or an
+  to a server with the "ssl" option. It can be used in a tcp-check or an
   http-check ruleset.
 
 ssl_bc_alg_keysize : integer