changelog.txt: Fix reversed markdown link syntax for #189 entry

Signed-off-by: Andrew Gunnerson <[email protected]>

app/magisk/updates/release/changelog.txt

@@ -3,7 +3,7 @@
 * Update Turkish and Russian translations (PR: #188, @EleoXDA)
 * Add hidden feature to customize the output filename (PR: #189, @chenxiaolong)
   * To avoid complicating BCR's code, there is no UI option for this
-  * To customize the output filenames, copy [./app/src/main/res/raw/filename_template.properties](the default template) to `bcr.properties` in the output directory and edit the file
+  * To customize the output filenames, copy [the default template](./app/src/main/res/raw/filename_template.properties) to `bcr.properties` in the output directory and edit the file
 
 ### Version 1.25