Update to latest go-md2man (#2201)

Since cpuguy83/go-md2man 2.0.5 no paraTag is written after "SEE ALSO".

With go-md2man 2.0.4:

.SH SEE ALSO
.PP
\fBroot-bbb(1)\fP, \fBroot-ccc(1)\fP

With go-md2man 2.0.5:

.SH SEE ALSO
\fBroot-bbb(1)\fP, \fBroot-ccc(1)\fP

See: cpuguy83/go-md2man#122

Signed-off-by: Mikel Olasagasti Uranga <mikel@olasagasti.info>

doc/man_docs_test.go

@@ -141,9 +141,6 @@ func TestGenManSeeAlso(t *testing.T) {
 	if err := assertLineFound(scanner, ".SH SEE ALSO"); err != nil {
 		t.Fatalf("Couldn't find SEE ALSO section header: %v", err)
 	}
-	if err := assertNextLineEquals(scanner, ".PP"); err != nil {
-		t.Fatalf("First line after SEE ALSO wasn't break-indent: %v", err)
-	}
 	if err := assertNextLineEquals(scanner, `\fBroot-bbb(1)\fP, \fBroot-ccc(1)\fP`); err != nil {
 		t.Fatalf("Second line after SEE ALSO wasn't correct: %v", err)
 	}

go.mod

@@ -3,7 +3,7 @@ module github.com/spf13/cobra
 go 1.15
 
 require (
-	github.com/cpuguy83/go-md2man/v2 v2.0.4
+	github.com/cpuguy83/go-md2man/v2 v2.0.5
 	github.com/inconshreveable/mousetrap v1.1.0
 	github.com/spf13/pflag v1.0.5
 	gopkg.in/yaml.v3 v3.0.1

go.sum

@@ -1,5 +1,5 @@
-github.com/cpuguy83/go-md2man/v2 v2.0.4 h1:wfIWP927BUkWJb2NmU/kNDYIBTh/ziUX91+lVfRxZq4=
-github.com/cpuguy83/go-md2man/v2 v2.0.4/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
+github.com/cpuguy83/go-md2man/v2 v2.0.5 h1:ZtcqGrnekaHpVLArFSe4HK5DoKx1T0rq2DwVB0alcyc=
+github.com/cpuguy83/go-md2man/v2 v2.0.5/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
 github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
 github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf35Ld67mk=