http/modify: move conditionals and ranges into "customize"

Closes #485

SUMMARY.md

@@ -145,12 +145,10 @@
   * [Method](http/method.md)
   * [Responses](http/response.md)
   * [Authentication](http/auth.md)
-  * [Ranges](http/ranges.md)
   * [HTTP versions](http/versions/README.md)
     * [HTTP/0.9](http/versions/http09.md)
     * [HTTP/2](http/versions/http2.md)
     * [HTTP/3](http/versions/http3.md)
-  * [Conditionals](http/conditionals.md)
   * [HTTP POST](http/post/README.md)
     * [Simple POST](http/post/simple.md)
     * [Content-Type](http/post/content-type.md)
@@ -166,13 +164,15 @@
     * [Multipart formposts](http/post/multipart.md)
     * [-d vs -F](http/post/postvspost.md)
   * [Redirects](http/redirects.md)
-  * [Modify the HTTP request](http/modify/README.md)
+  * [Customize your HTTP](http/modify/README.md)
     * [Request method](http/modify/method.md)
     * [Request target](http/modify/target.md)
     * [Fragment](http/modify/fragment.md)
     * [Customize headers](http/modify/headers.md)
     * [Referer](http/modify/referer.md)
     * [User-agent](http/modify/user-agent.md)
+    * [Ranges](http/modify/ranges.md)
+    * [Conditionals](http/modify/conditionals.md)
   * [HTTP PUT](http/put.md)
   * [Cookies](http/cookies/README.md)
     * [Cookie engine](http/cookies/engine.md)

http/README.md

@@ -12,12 +12,10 @@ the specific HTTPS section.
   * [Method](method.md)
   * [Responses](response.md)
   * [Authentication](auth.md)
-  * [Ranges](ranges.md)
   * [HTTP versions](versions/)
-  * [Conditionals](conditionals.md)
   * [HTTP POST](post/)
   * [Redirects](redirects.md)
-  * [Modify the HTTP request](modify/)
+  * [Customize your HTTP](modify/)
   * [HTTP PUT](put.md)
   * [Cookies](cookies/)
   * [HTTPS](https.md)

http/modify/README.md

@@ -1,15 +1,17 @@
-# Modify the HTTP request
+# Customize your HTTP
 
-As described earlier, each HTTP transfer starts with curl sending an HTTP
-request. That request consists of a request line and a number of request
-headers, and this chapter details how you can modify all of those.
+As described earlier, each HTTP transfer starts with curl sending a *request*.
+This request consists of a request line and a number of request headers, and
+this chapter details how you can customize those.
 
 * [Request method](method.md)
 * [Request target](target.md)
 * [Fragment](fragment.md)
 * [Customize headers](headers.md)
 * [Referer](referer.md)
 * [User-agent](user-agent.md)
+* [Ranges](ranges.md)
+* [Conditionals](conditionals.md)
 
 Of course, changing the [HTTP version](../versions/) is another way to alter
 the request.