misc: remove duplicate words

Closes #11740

docs/SECURITY-ADVISORY.md

@@ -2,7 +2,7 @@
 
 As described in the [Security Process](https://curl.se/dev/secprocess.html)
 document, when a security vulnerability has been reported to the project and
-confirmed, we author an advisory document for for the issue. It should ideally
+confirmed, we author an advisory document for the issue. It should ideally
 be written in cooperation with the reporter to make sure all the angles and
 details of the problem are gathered and described correctly and succinctly.
 

lib/url.c

@@ -953,7 +953,7 @@ static bool extract_if_dead(struct connectdata *conn,
          * that we expect - in general - no waiting input data. Input
          * waiting might be a TLS Notify Close, for example. We reject
          * that.
-         * For protocols where data from other other end may arrive at
+         * For protocols where data from other end may arrive at
          * any time (HTTP/2 PING for example), the protocol handler needs
          * to install its own `connection_check` callback.
          */

scripts/delta

@@ -53,7 +53,7 @@ $ncommitters = $acommitters - $bcommitters;
 
 # number of contributors right now
 $acontribs = `./scripts/contrithanks.sh | grep -c '^[^ ]'`;
-# number when the tag tag was set
+# number when the tag was set
 $bcontribs = `git show $start:docs/THANKS | grep -c '^[^ ]'`;
 # delta
 $contribs = $acontribs - $bcontribs;