curl_slist_append.md: clarify that a NULL pointer is not acceptable
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| @@ -28,9 +28,10 @@ struct curl_slist *curl_slist_append(struct curl_slist *list, | |
| curl_slist_append(3) appends a string to a linked list of strings. The | |
| existing **list** should be passed as the first argument and the new list is | |
| - | returned from this function. Pass in NULL in the **list** argument to create |
| - | a new list. The specified **string** has been appended when this function |
| - | returns. curl_slist_append(3) copies the string. |
| + | returned from this function. Pass in NULL in the **list** argument to create a |
| + | new list. The specified **string** has been appended when this function |
| + | returns. curl_slist_append(3) copies the string. The **string** argument must |
| + | be a valid string pointer and cannot be NULL. |
| The list should be freed again (after usage) with | |
| curl_slist_free_all(3). | |