doc: Remove generated manual pages from master branch

Replace the generated manual pages on the master branch with
placeholders with instructions. The master branch is too much in flux
for anything generated from command output to be kept up to date,
and having pages from versions ago looks silly.

We can't remove them completely because `make dist` relies
on the files being present.

Resolves #20031.

doc/man/bitcoin-wallet.1

@@ -1,63 +1,5 @@
-.\" DO NOT MODIFY THIS FILE!  It was generated by help2man 1.47.6.
-.TH BITCOIN-WALLET "1" "February 2019" "bitcoin-wallet v0.17.99.0" "User Commands"
+.TH BITCOIN-WALLET "1"
 .SH NAME
-bitcoin-wallet \- manual page for bitcoin-wallet v0.17.99.0
-.SH DESCRIPTION
-Bitcoin Core bitcoin\-wallet version v0.17.99.0
-.PP
-wallet\-tool is an offline tool for creating and interacting with Bitcoin Core wallet files.
-By default wallet\-tool will act on wallets in the default mainnet wallet directory in the datadir.
-To change the target wallet, use the \fB\-datadir\fR, \fB\-wallet\fR and \fB\-testnet\fR/\-regtest arguments.
-.SS "Usage:"
-.IP
-bitcoin\-wallet [options] <command>
-.SH OPTIONS
-.HP
-\-?
-.IP
-Print this help message and exit
-.HP
-\fB\-datadir=\fR<dir>
-.IP
-Specify data directory
-.HP
-\fB\-wallet=\fR<wallet\-name>
-.IP
-Specify wallet name
-.PP
-Debugging/Testing options:
-.HP
-\fB\-debug=\fR<category>
-.IP
-Output debugging information (default: 0).
-.HP
-\fB\-printtoconsole\fR
-.IP
-Send trace/debug info to console (default: 1 when no \fB\-debug\fR is true, 0
-otherwise.
-.PP
-Chain selection options:
-.HP
-\fB\-testnet\fR
-.IP
-Use the test chain
-.PP
-Commands:
-.IP
-create
-.IP
-Create new wallet file
-.IP
-info
-.IP
-Get wallet info
-.SH COPYRIGHT
-Copyright (C) 2009-2019 The Bitcoin Core developers
+bitcoin-wallet \- manual page for bitcoin-wallet
 
-Please contribute if you find Bitcoin Core useful. Visit
-<https://bitcoincore.org> for further information about the software.
-The source code is available from <https://github.com/bitcoin/bitcoin>.
-
-This is experimental software.
-Distributed under the MIT software license, see the accompanying file COPYING
-or <https://opensource.org/licenses/MIT>
+This is a placefolder file. Please follow the instructions in \fIcontrib/devtools/README.md\fR to generate the manual pages after a release.