Style: replace "!rank" with "rank == 0"

In SF tutorial ex1 (src/vec/is/sf/tutorials/ex1.c), add parentheses around "rank == 0". This is relevant because ! binds more tightly than +, but == binds les

Style: replace "!rank" with "rank == 0"

In SF tutorial ex1 (src/vec/is/sf/tutorials/ex1.c), add parentheses around "rank == 0". This is relevant because ! binds more tightly than +, but == binds less
tightly, so the result of the computation would otherwise change.

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Merge remote-tracking branch 'origin/jose/fix-manpages'

Fix manpages to avoid errors reported by doctext

See merge request petsc/petsc!4309

Fix manpages: Input/Output Parameter --> Parameters

Merge branch 'barry/2021-05-16/fix-double-lines' into 'main'

Fix typos in source

See merge request petsc/petsc!3984

Remove all double blank lines from source

Commit-type: petsc-style
/2h

Merge branch 'psanan/2021-02-28/yaml-cleanups' into 'main'

PetscOptionsInsertFileYAML man page minor cleanup

See merge request petsc/petsc!3665

Merge branch 'dalcinl/fix-yaml' into 'main'

YAML: Ignore empty documents and add tests for multiple documents

See merge request petsc/petsc!3721

Update PetscOptionsInsertFileYAML man page

Remove outdated information and note that this function call
PetscOptionsInsertStringYAML().

YAML: Ignore empty documents and add tests for multiple documents

Merge branch 'dalcinl/vendor-libyaml' into 'master'

Vendor LibYAML

See merge request petsc/petsc!3652

YAML: Enable use of vendored LibYAML

YAML: Move YAML options implementation sources closer to related sources