doc: update URLs

Some are now redirecting, some are outdated, i.e qt5.

doc/build-windows-msvc.md

@@ -19,7 +19,7 @@ The former is assumed hereinafter.
 
 ### 2. Git
 
-Download and install [Git for Windows](https://git-scm.com/download/win). Once installed, Git is available from PowerShell or the Command Prompt.
+Download and install [Git for Windows](https://git-scm.com/downloads/win). Once installed, Git is available from PowerShell or the Command Prompt.
 
 ### 3. Clone Bitcoin Repository
 

doc/files.md

@@ -98,7 +98,7 @@ Subdirectory | File                 | Description
 
 ## GUI settings
 
-`bitcoin-qt` uses [`QSettings`](https://doc.qt.io/qt-5/qsettings.html) class; this implies platform-specific [locations where application settings are stored](https://doc.qt.io/qt-5/qsettings.html#locations-where-application-settings-are-stored).
+`bitcoin-qt` uses [`QSettings`](https://doc.qt.io/qt-6/qsettings.html) class; this implies platform-specific [locations where application settings are stored](https://doc.qt.io/qt-6/qsettings.html#locations-where-application-settings-are-stored).
 
 ## Legacy subdirectories and files
 

doc/tracing.md

@@ -45,7 +45,7 @@ The two main eBPF front-ends with support for USDT are [bpftrace] and
 `bpftrace` is preferred for one-liners and shorter scripts. Examples for both can
 be found in [contrib/tracing].
 
-[bpftrace]: https://github.com/iovisor/bpftrace
+[bpftrace]: https://github.com/bpftrace/bpftrace
 [BPF Compiler Collection (BCC)]: https://github.com/iovisor/bcc
 [contrib/tracing]: ../contrib/tracing/
 

doc/translation_process.md

@@ -8,7 +8,7 @@ Transifex is setup to monitor the GitHub repo for updates, and when code contain
 
 Multiple language support is critical in assisting Bitcoin’s global adoption, and growth. One of Bitcoin’s greatest strengths is cross-border money transfers, any help making that easier is greatly appreciated.
 
-See the [Transifex Bitcoin project](https://www.transifex.com/bitcoin/bitcoin/) to assist in translations. You should also join the translation mailing list for announcements - see details below.
+See the [Transifex Bitcoin project](https://explore.transifex.com/bitcoin/bitcoin/) to assist in translations. You should also join the translation mailing list for announcements - see details below.
 
 ### Writing code with translations
 We use automated scripts to help extract translations in both Qt, and non-Qt source files. It is rarely necessary to manually edit the files in `src/qt/locale/`. The translation source files must adhere to the following format:
@@ -39,9 +39,9 @@ git commit
 ```
 
 ### Creating a Transifex account
-Visit the [Transifex Signup](https://www.transifex.com/signup/) page to create an account. Take note of your username and password, as they will be required to configure the command-line tool.
+Visit the [Transifex Signup](https://app.transifex.com/signup/open-source/) page to create an account. Take note of your username and password, as they will be required to configure the command-line tool.
 
-You can find the Bitcoin translation project at [https://www.transifex.com/bitcoin/bitcoin/](https://www.transifex.com/bitcoin/bitcoin/).
+You can find the Bitcoin translation project at [https://www.transifex.com/bitcoin/bitcoin/](https://explore.transifex.com/bitcoin/bitcoin/).
 
 ### Installing the Transifex client command-line tool
 The client is used to fetch updated translations. Please check installation instructions and any other details at https://developers.transifex.com/docs/cli.

doc/zmq.md

@@ -154,7 +154,7 @@ The 8-byte LE uints correspond to _mempool sequence number_ and the types of bod
 ### Implementing ZMQ client
 
 ZeroMQ endpoint specifiers for TCP (and others) are documented in the
-[ZeroMQ API](http://api.zeromq.org/4-0:_start).
+[ZeroMQ API](https://libzmq.readthedocs.io/en/zeromq4-x/).
 
 Client side, then, the ZeroMQ subscriber socket must have the
 ZMQ_SUBSCRIBE option set to one or either of these prefixes (for