docs(cargo-fix): remove unnecessary issue tracker link

I believe it is a leftover when cargo-fix was an external command.

Author: weihanglo

src/doc/man/cargo-fix.md

@@ -37,10 +37,6 @@ pass `--target` to fix code for the given target.
 
     cargo fix --target x86_64-pc-windows-gnu
 
-If you encounter any problems with `cargo fix` or otherwise have any questions
-or feature requests please don't hesitate to file an issue at
-<https://github.com/rust-lang/cargo>.
-
 ### Edition migration
 
 The `cargo fix` subcommand can also be used to migrate a package from one

src/doc/man/generated_txt/cargo-fix.txt

@@ -33,10 +33,6 @@ DESCRIPTION
 
            cargo fix --target x86_64-pc-windows-gnu
 
-       If you encounter any problems with cargo fix or otherwise have any
-       questions or feature requests please don’t hesitate to file an issue
-       at <https://github.com/rust-lang/cargo>.
-
    Edition migration
        The cargo fix subcommand can also be used to migrate a package from one
        edition

src/doc/src/commands/cargo-fix.md

@@ -33,10 +33,6 @@ pass `--target` to fix code for the given target.
 
     cargo fix --target x86_64-pc-windows-gnu
 
-If you encounter any problems with `cargo fix` or otherwise have any questions
-or feature requests please don't hesitate to file an issue at
-<https://github.com/rust-lang/cargo>.
-
 ### Edition migration
 
 The `cargo fix` subcommand can also be used to migrate a package from one

src/etc/man/cargo-fix.1

@@ -43,10 +43,6 @@ pass \fB\-\-target\fR to fix code for the given target.
 cargo fix \-\-target x86_64\-pc\-windows\-gnu
 .fi
 .RE
-.sp
-If you encounter any problems with \fBcargo fix\fR or otherwise have any questions
-or feature requests please don\[cq]t hesitate to file an issue at
-<https://github.com/rust\-lang/cargo>\&.
 .SS "Edition migration"
 The \fBcargo fix\fR subcommand can also be used to migrate a package from one
 \fIedition\fR <https://doc.rust\-lang.org/edition\-guide/editions/transitioning\-an\-existing\-project\-to\-a\-new\-edition.html> to the next. The general procedure is: