default.spec: update outdated/invalid urls (#1791)

buildozer/default.spec

@@ -102,7 +102,7 @@ fullscreen = 0
 #icon.adaptive_background.filename = %(source.dir)s/data/icon_bg.png
 
 # (list) Permissions
-# (See https://python-for-android.readthedocs.io/en/latest/buildoptions/#build-options-1 for all the supported syntaxes and properties)
+# (See https://python-for-android.readthedocs.io/en/latest/buildoptions.html for all the supported syntaxes and properties)
 #android.permissions = android.permission.INTERNET, (name=android.permission.WRITE_EXTERNAL_STORAGE;maxSdkVersion=18)
 
 # (list) features (adds uses-feature -tags to manifest)
@@ -223,11 +223,11 @@ fullscreen = 0
 
 # (list) Gradle repositories to add {can be necessary for some android.gradle_dependencies}
 # please enclose in double quotes 
-# e.g. android.gradle_repositories = "maven { url 'https://kotlin.bintray.com/ktor' }"
+# e.g. android.gradle_repositories = "maven { url 'https://repo.spring.io/release' }"
 #android.add_gradle_repositories =
 
-# (list) packaging options to add 
-# see https://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.PackagingOptions.html
+# (list) packaging options to add
+# see https://developer.android.com/reference/tools/gradle-api/7.1/com/android/build/api/dsl/PackagingOptions
 # can be necessary to solve conflicts in gradle_dependencies
 # please enclose in double quotes 
 # e.g. android.add_packaging_options = "exclude 'META-INF/common.kotlin_module'", "exclude 'META-INF/*.kotlin_module'"