Put one BuildRequires on each line and sort the entries

mercurial.spec

@@ -13,9 +13,14 @@ URL: https://mercurial-scm.org/
 Source0: https://www.mercurial-scm.org/release/%{name}-%{upstreamversion}.tar.gz
 Source1: mercurial-site-start.el
 Patch2: 0001-setup-hg3.patch
-BuildRequires: python3-devel bash-completion
-BuildRequires: emacs-nox emacs-el pkgconfig gettext python3-docutils
+BuildRequires: bash-completion
+BuildRequires: emacs-el
+BuildRequires: emacs-nox
 BuildRequires: gcc
+BuildRequires: gettext
+BuildRequires: pkgconfig
+BuildRequires: python3-devel
+BuildRequires: python3-docutils
 
 # Priorities for the alternatives system
 %global py3_priority 30
@@ -35,7 +40,8 @@ Provides: hg3 = %{version}-%{release}
 Provides: hg = %{version}-%{release}
 Provides: %{name} = %{version}-%{release}
 Provides: %{name}%{?_isa} = %{version}-%{release}
-Requires: python3 emacs-filesystem
+Requires: python3
+Requires: emacs-filesystem
 Requires: %{name}-lang = %{version}-%{release}
 Obsoletes: %{name}-py2 < %{version}-%{release}
 Requires(post): %{_sbindir}/update-alternatives
@@ -54,9 +60,10 @@ This Mercurial runs on Python 3 and is obsoleting the Python 2 version.
 
 %package hgk
 Summary:    Hgk interface for mercurial
-Requires:   hg = %{version}-%{release}, tk
+Requires:   hg = %{version}-%{release}
+Requires:   tk
 
-Requires:   hg3 = %{version}-%{release}, tk
+Requires:   hg3 = %{version}-%{release}
 
 %description hgk
 A Mercurial extension for displaying the change history graphically