fix: update some broken link to valid URL

Author: acolombier

source/chapters/appendix/changelog.rst

@@ -973,7 +973,7 @@ Vinyl Control
 * Fix handling of "vinylcontrol_enabled" causes a frozen vinyl spinny mouse control
   `#15168 <https://github.com/mixxxdj/mixxx/pull/15168>`__
   `#15165 <https://github.com/mixxxdj/mixxx/issues/15165>`__
-* Pitch filter improvements `#15230 <https15054://github.com/mixxxdj/mixxx/pull/15230>`__
+* Pitch filter improvements `#15230 <https://github.com/mixxxdj/mixxx/pull/15230>`__
 * Add a quadrature phase tracker
   `#15217 <https://github.com/mixxxdj/mixxx/pull/15217>`__
   `#15283 <https://github.com/mixxxdj/mixxx/pull/15283>`__

source/hardware/controllers/denon_mc4000.md

@@ -8,7 +8,7 @@ wheels, performers get access to dedicated hot cue and sample pads for
 on-the-fly remixes.
 
 -  [Manufacturer’s product page](https://www.denondj.com/mc4000-mc4000xus)
--  [Manual / Midi commands](http://https://cdn.inmusicbrands.com/denondj/MC4000/MC4000-User-Guide-v1.2_00.pdf)
+-  [Manual / Midi commands](https://web.archive.org/web/20260221060200/http://cdn.inmusicbrands.com:80/denondj/MC4000/MC4000-User-Guide-v1.2_00.pdf)
 -  [Forum thread](https://mixxx.discourse.group/t/denon-mc4000-mapping/15311)
 
 The microphone and auxiliary inputs are mixed with the main output in