CODE_STYLE: add column alignment section

Note that since the added examples are for column alignment I had to
encapsulate with ~~~c markdown to preserve their alignment.

docs/CODE_STYLE.md

@@ -72,8 +72,12 @@ the initial keyword. Like this:
       /* clearly a youngster */
     }
 
-When we write functions however, the opening brace should be in the first
+You may omit the braces if they would contain only a one-line statement:
-column of the first line:
+
+    if(!x)
+      continue;
+
+For functions the opening brace should be on a separate line:
 
     int main(int argc, char **argv)
     {
@@ -162,6 +166,53 @@ Examples:
     complement = ~bits;
     empty = (!*string) ? TRUE : FALSE;
 
+## Column alignment
+
+Some statements cannot be completed on a single line because the line would
+be too long, the statement too hard to read, or due to other style guidelines
+above. In such a case the statement will span multiple lines.
+
+If a continuation line is part of an expression or sub-expression then you
+should align on the appropriate column so that it's easy to tell what part of
+the statement it is. Operators should not start continuation lines. In other
+cases follow the 2-space indent guideline. Here are some examples from libcurl:
+
+~~~c
+    if(Curl_pipeline_wanted(handle->multi, CURLPIPE_HTTP1) &&
+       (handle->set.httpversion != CURL_HTTP_VERSION_1_0) &&
+       (handle->set.httpreq == HTTPREQ_GET ||
+        handle->set.httpreq == HTTPREQ_HEAD))
+      /* didn't ask for HTTP/1.0 and a GET or HEAD */
+      return TRUE;
+~~~
+
+~~~c
+  case CURLOPT_KEEP_SENDING_ON_ERROR:
+    data->set.http_keep_sending_on_error = (0 != va_arg(param, long)) ?
+                                           TRUE : FALSE;
+    break;
+~~~
+
+~~~c
+    data->set.http_disable_hostname_check_before_authentication =
+      (0 != va_arg(param, long)) ? TRUE : FALSE;
+~~~
+
+~~~c
+  if(option) {
+    result = parse_login_details(option, strlen(option),
+                                 (userp ? &user : NULL),
+                                 (passwdp ? &passwd : NULL),
+                                 NULL);
+  }
+~~~
+
+~~~c
+        DEBUGF(infof(data, "Curl_pp_readresp_ %d bytes of trailing "
+                     "server response left\n",
+                     (int)clipamount));
+~~~
+
 ## Platform dependent code
 
 Use `#ifdef HAVE_FEATURE` to do conditional code. We avoid checking for