cmdline-opts/page-footer: remove long option nroff formatting

As gen.pl adds them

docs/cmdline-opts/page-footer

@@ -49,10 +49,10 @@ If set, the specified number of characters will be used as the terminal width
 when the alternative progress-bar is shown. If not set, curl will try to
 figure it out using other ways.
 .IP "CURL_CA_BUNDLE <file>"
-If set, will be used as the \fI--cacert\fP value.
+If set, will be used as the --cacert value.
 .IP "CURL_HOME <dir>"
 If set, is the first variable curl checks when trying to find its home
-directory. If not set, it continues to check \fBXDG_CONFIG_HOME\fP.
+directory. If not set, it continues to check *XDG_CONFIG_HOME*
 .IP "CURL_SSL_BACKEND <TLS backend>"
 If curl was built with support for "MultiSSL", meaning that it has built-in
 support for more than one TLS backend, this environment variable can be set to
@@ -64,7 +64,7 @@ SSL backend names (case-insensitive): bearssl, gnutls, gskit, mbedtls,
 nss, openssl, rustls, schannel, secure-transport, wolfssl
 .IP "HOME <dir>"
 If set, this is used to find the home directory when that is needed. Like when
-looking for the default .curlrc. \fBCURL_HOME\fP and \fBXDG_CONFIG_HOME\fP
+looking for the default .curlrc. *CURL_HOME* and *XDG_CONFIG_HOME*
 have preference.
 .IP "QLOGDIR <directory name>"
 If curl was built with HTTP/3 support, setting this environment variable to a
@@ -74,9 +74,9 @@ files can become rather large. Works with both QUIC backends.
 .IP SHELL
 Used on VMS when trying to detect if using a DCL or a "unix" shell.
 .IP "SSL_CERT_DIR <dir>"
-If set, will be used as the \fI--capath\fP value.
+If set, will be used as the --capath value.
 .IP "SSL_CERT_FILE <path>"
-If set, will be used as the \fI--cacert\fP value.
+If set, will be used as the --cacert value.
 .IP "SSLKEYLOGFILE <file name>"
 If you set this environment variable to a file name, curl will store TLS
 secrets from its connections in that file when invoked to enable you to
@@ -88,7 +88,7 @@ On Windows, this variable is used when trying to find the home directory. If
 the other, primary, variable are all unset. If set, curl will use the path
 "$USERPROFILE\\Application Data".
 .IP "XDG_CONFIG_HOME <dir>"
-If \fBCURL_HOME\fP is not set, this variable is checked when looking for a
+If *CURL_HOME* is not set, this variable is checked when looking for a
 default .curlrc file.
 .SH "PROXY PROTOCOL PREFIXES"
 The proxy string may be specified with a protocol:// prefix to specify