Fix links to issue tracker in manuals (#2581)

Author: kukimik

dhall-docs/src/Dhall/data/man/dhall-docs.1

@@ -33,4 +33,4 @@ Format rendered code using ASCII syntax
 .SH BUGS
 .PP
 Please report any bugs you may come across to
-https://github.com/dhall-language/dhall-haskell/issues.
+https://github.com/dhall-lang/dhall-haskell/issues.

dhall-docs/src/Dhall/data/man/dhall-docs.md

@@ -35,4 +35,4 @@ dhall-docs - Dhall documentation tool
 # BUGS
 
 Please report any bugs you may come across to
-https://github.com/dhall-language/dhall-haskell/issues.
+https://github.com/dhall-lang/dhall-haskell/issues.

dhall/man/dhall.1

@@ -97,4 +97,4 @@ https://docs.dhall-lang.org/howtos/Text-Editor-Configuration.html
 .SH BUGS
 .PP
 Please report any bugs you may come across to
-https://github.com/dhall-language/dhall-haskell/issues.
+https://github.com/dhall-lang/dhall-haskell/issues.

dhall/man/dhall.md

@@ -100,4 +100,4 @@ https://docs.dhall-lang.org/howtos/Text-Editor-Configuration.html
 # BUGS
 
 Please report any bugs you may come across to
-https://github.com/dhall-language/dhall-haskell/issues.
+https://github.com/dhall-lang/dhall-haskell/issues.