curl.1: fix "The the" typo

Reported-by: Jon Seymour

docs/curl.1

@@ -1914,10 +1914,10 @@ alter the way curl behaves. So for example if you want to make a proper HEAD
 request, using -X HEAD will not suffice. You need to use the \fI-I, --head\fP
 option.
 
-The the method string you set with -X will be used for all requests, which if
-you for example use \fB-L, --location\fP may cause unintended side-effects
-when curl doesn't change request method according to the HTTP 30x response
-codes - and similar.
+The method string you set with -X will be used for all requests, which if you
+for example use \fB-L, --location\fP may cause unintended side-effects when
+curl doesn't change request method according to the HTTP 30x response codes -
+and similar.
 
 (FTP)
 Specifies a custom FTP command to use instead of LIST when doing file lists