tidy-up: miscellaneous

- avoid "will" in builds scripts, scripts folder, curl_easy_ssls_export.md,
  and few other files.
- badwords: add "initialise", "nul terminated", "thread safety" and
  variations.
- prefer "null-terminat", where missing (two places).
- fix "null-terminat*" missing dash.
- hostip: merge two `#if` blocks.
- tool_doswin: fix comment
  Spotted by GitHub Code Quality
  Follow-up to 9a2663322c #17572
- fix stray spaces and newlines.

Closes #21638

src/tool_doswin.c

@@ -804,7 +804,7 @@ curl_socket_t win32_stdin_read_thread(void)
       break;
     }
 
-    /* Bind to any available loopback port */
+    /* Retrieve the assigned loopback port/address */
     if(getsockname(tdata->socket_l, (struct sockaddr *)&selfaddr, &socksize)) {
       errorf("getsockname error: %d", SOCKERRNO);
       break;