Closes gh-18007

Update reference documentation to use one sentence per line formatting
as recommended by the Asciidoctor team.

Closes gh-12445

Closes gh-17965

Closes gh-17996

* gh-17976:
  Use exec when launching the JVM in CLI's shell script

Closes gh-17976

Previously, when the Spring Boot CLI ran the Java command line for an
application it did a straight invocation which suppressed propagation of
signals to the JVM in certain circumstances (e.g within Docker containers).

This change prepends the command with exec which causes the Java process to
replace the script process in a shell ensuring that signals are propagated to
the Java process without suppression.

See gh-17976
Signed-off-by: Ben Hale <bhale@pivotal.io>

* gh-17991:
  Polish "Improve handling of non-standard status codes in RestTemplate metrics"
  Improve handling of non-standard status codes in RestTemplate metrics

Closes gh-17991

See gh-17991

See gh-17991

Closes gh-17995

* gh-17984:
  Test the Gradle Plugin against Gradle 5.6.1

Closes gh-17984

See gh-17984

Closes gh-17984

Closes gh-17994

Previously, MetaInfResourceManager that we use with Undertow to serve
static resources from jar's META-INF/resources did not correctly
handle characters in the path that should be percent-encoded when
used in a URL.

This commit updates MetaInfResourceManager to encode the path before
it is used to create a URL. Prior to this encoding, encoded slashes
(%2F) are decoded as, unlike other encoded characters in the request's
URL, encoded slashes are not decoded prior to calling the
ResourceManager.

Fixes gh-17853

Closes gh-17982

Closes gh-17907

* gh-17981:
  Upgrade to Git commit ID plugin 3.0.1

Closes gh-17981

See gh-17981

* pr/17962:
  Polish contribution
  Polish

Closes gh-17962

See gh-17962

See gh-17962

Closes gh-17980

This commit also changes the request matcher for MVC
endpoints to use an AntPathRequestMatcher instead of an
MvcRequestMatcher. The endpoint is always available
under the mapped endpoint path and this way the same matcher
can be used for both MVC and Jersey.

Fixes gh-17912
Co-authored-by: Phillip Webb <pwebb@pivotal.io>

* gh-17973:
  Fix upstream RSocket method renames

Closes gh-17973

See gh-17973

* pr/17782:
  Add dependency management for IBM DB2 JDBC driver

Closes gh-17782

See gh-17782

* pr/17970:
  Polish "Fix a broken Asciidoctor syntax"
  Fix a broken Asciidoctor syntax

Closes gh-17970

See gh-17970

See gh-17970

Closes gh-17972

* pr/17968:
  Fix Undertow access log dir property name in doc

Closes gh-17968

See gh-17968

Fixes gh-17967

Fixes gh-17959

Move management `ErrorPage` registration from the
`WebMvcEndpointChildContextConfiguration` to
`WebMvcEndpointChildContextConfiguration` and only add it when the
error controller is registered.

Fixes gh-17938

See gh-17839

See gh-17848

Closes gh-17953