Fix DL_WARN_documented_change URL

The doc_link argument is really a URL fragment within the
android-changes-for-ndk-developers.md document, not a filename at the
root of the bionic repository.

Test: manual
Bug: none
Change-Id: I1b542e47aca132ce43ba1d50d83db1bf3c7b10c6
diff --git a/linker/linker_globals.cpp b/linker/linker_globals.cpp
index bcc2a1e..31da02c 100644
--- a/linker/linker_globals.cpp
+++ b/linker/linker_globals.cpp
@@ -50,7 +50,7 @@
   return sizeof(__linker_dl_err_buf);
 }
 
-void DL_WARN_documented_change(int api_level, const char* doc_link, const char* fmt, ...) {
+void DL_WARN_documented_change(int api_level, const char* doc_fragment, const char* fmt, ...) {
   std::string result{"Warning: "};
 
   va_list ap;
@@ -60,8 +60,9 @@
 
   android::base::StringAppendF(&result,
                                " and will not work when the app moves to API level %d or later "
-                               "(https://android.googlesource.com/platform/bionic/+/master/%s) "
-                               "(allowing for now because this app's target API level is still %d)",
-                               api_level, doc_link, get_application_target_sdk_version());
+                               "(%s#%s) (allowing for now because this app's target API level is "
+                               "still %d)",
+                               api_level, kBionicChangesUrl, doc_fragment,
+                               get_application_target_sdk_version());
   DL_WARN("%s", result.c_str());
 }