Add link to troubleshooting guide in library update error log file

app/src/main/java/eu/kanade/tachiyomi/data/library/LibraryUpdateService.kt

@@ -552,6 +552,7 @@ class LibraryUpdateService(
             if (errors.isNotEmpty()) {
                 val file = createFileInCacheDir("tachiyomi_update_errors.txt")
                 file.bufferedWriter().use { out ->
+                    out.write(getString(R.string.library_errors_help, ERROR_LOG_HELP_URL) + "\n\n")
                     // Error file format:
                     // ! Error
                     //   # Source
@@ -577,3 +578,4 @@ class LibraryUpdateService(
 }
 
 private const val MANGA_PER_SOURCE_QUEUE_WARNING_THRESHOLD = 60
+private const val ERROR_LOG_HELP_URL = "https://tachiyomi.org/help/guides/troubleshooting"

app/src/main/res/values/strings.xml

@@ -118,7 +118,7 @@
     <string name="action_reset">Reset</string>
     <string name="action_undo">Undo</string>
     <string name="action_open_log">Open log</string>
-    <string name="action_show_errors">See full error details</string>
+    <string name="action_show_errors">Tap to see error details</string>
     <string name="action_create">Create</string>
     <string name="action_restore">Restore</string>
     <string name="action_webview_back">Back</string>
@@ -732,6 +732,7 @@
     </plurals>
     <string name="notification_cover_update_failed">Failed to update cover</string>
     <string name="notification_first_add_to_library">Please add the manga to your library before doing this</string>
+    <string name="library_errors_help">For help on how to fix library update errors, see %1$s</string>
 
     <!-- File Picker Titles -->
     <string name="file_select_cover">Select cover image</string>