Fix #16700: Tiny errors in output of GHCi commands :forward and :info

`:info Coercible` now outputs the correct section number of the GHCi User's guide together with the secion title.

`:forward x` gives the correct syntax hint.
20 jobs for master in 452 minutes and 41 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Lint
passed #93463
lint
lint-submods

00:00:14

 
  Build
passed #93465
x86_64-linux
hadrian-ghc-in-ghci

00:19:14

failed #93467
x86_64-linux allowed to fail
release-x86_64-linux-deb9-dwarf

01:27:32

failed #93464
x86_64-linux allowed to fail
validate-x86_64-linux-deb8-hadrian

02:07:53

passed #93466
x86_64-linux
validate-x86_64-linux-deb9-debug

01:15:21

 
  Full Build
failed #93469
aarch64-linux allowed to fail
validate-aarch64-linux-deb9

00:00:00

passed #93470
x86_64-linux
validate-i386-linux-deb9

01:19:31

passed #93468
x86_64-darwin
validate-x86_64-darwin

00:59:43

passed #93471
x86_64-linux
validate-x86_64-linux-deb9

01:22:46

passed #93473
x86_64-linux
validate-x86_64-linux-deb9-integer-simple

01:41:34

passed #93472
x86_64-linux
validate-x86_64-linux-deb9-llvm

02:29:07

passed #93474
x86_64-linux
validate-x86_64-linux-deb9-unreg

03:20:19

passed #93475
x86_64-linux
validate-x86_64-linux-fedora27

01:23:05

failed #93477
x86_64-windows allowed to fail
validate-x86_64-windows

02:24:54

failed #93476
x86_64-windows allowed to fail
validate-x86_64-windows-hadrian

00:34:58

 
  Cleanup
passed #93478
x86_64-darwin
cleanup-darwin

00:00:05

 
  Packaging
passed #93479
x86_64-linux
doc-tarball

00:12:17

 
  Hackage
manual #93480
x86_64-linux allowed to fail manual
hackage
 
  Deploy
passed #93481
x86_64-linux
pages

00:03:01

failed pages:deploy

00:00:00

 
Name Stage Failure
failed
release-x86_64-linux-deb9-dwarf Build
$ cp -Rf $HOME/.cabal cabal-cache
Uploading artifacts...
ghc-*.tar.xz: found 1 matching files
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=93467 responseStatus=201 Created token=QxxbSMod
Uploading artifacts...
junit.xml: found 1 matching files

Uploading artifacts to coordinator... ok
id=93467 responseStatus=201 Created token=QxxbSMod
ERROR: Job failed: exit code 1
failed
validate-x86_64-linux-deb8-hadrian Build
Exit code: 1
Stderr:
)


Uploading artifacts...
junit.xml: found 1 matching files
Uploading artifacts to coordinator... ok
id=93464 responseStatus=201 Created token=zUQcSfvC
ERROR: Job failed: exit code 1
failed
validate-aarch64-linux-deb9 Full Build
Running with gitlab-runner 11.12.0~beta.1460.g3aac76a8 (3aac76a8)
on centriq.haskell.org 3bed8b97
Using Docker executor with image registry.gitlab.haskell.org/ghc/ci-images/aarch64-linux-deb9:ac65f31dcffb09cd7ca7aaa70f447fcbb19f427f ...
Pulling docker image gitlab/gitlab-runner-helper:arm-3aac76a8 ...
ERROR: Job failed: Error response from daemon: manifest for gitlab/gitlab-runner-helper:arm-3aac76a8 not found (executor_docker.go:173:0s)
failed
validate-x86_64-windows-hadrian Full Build
   Speed :            23034307 Bytes/sec.
Speed : 1318.033 MegaBytes/min.
Ended : Friday, June 7, 2019 6:13:25 PM

Uploading artifacts...
Runtime platform arch=amd64 os=windows pid=6624 revision=1f513601 version=11.10.1
WARNING: ghc.tar.xz: no matching files
ERROR: No files to upload
ERROR: Job failed: exit status 1
failed
validate-x86_64-windows Full Build
junit.xml: found 1 matching files                  
WARNING: Failed to load system CertPool:crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=93477 responseStatus=201 Created token=7DsZsrcV
Uploading artifacts...
Runtime platform
arch=amd64 os=windows pid=6540 revision=1f513601 version=11.10.1
junit.xml: found 1 matching files

WARNING: Failed to load system CertPool:crypto/x509: system root pool is not available on Windows
Uploading artifacts to coordinator... ok
id=93477 responseStatus=201 Created token=7DsZsrcV
ERROR: Job failed: exit status 2