Remove `man` from `.gitignore`

Changes to be committed:
modified:   .gitignore
new file:   man/ensureHashRegistryState-character-character-environment-method.Rd
new file:   man/ensureHashRegistryState-character-missing-environment-method.Rd
new file:   man/ensureHashRegistryState.Rd
new file:   man/getBoilerplateCode-Reactr.BindingContractMonitored.S3-method.Rd
new file:   man/getBoilerplateCode-Reactr.BindingContractMonitoring.S3-method.Rd
new file:   man/getBoilerplateCode-Reactr.BindingContractMutual.S3-method.Rd
new file:   man/getBoilerplateCode.Rd
new file:   man/getValue-character-environment-method.Rd
new file:   man/getValue-character-missing-method.Rd
new file:   man/getValue.Rd
new file:   man/reactr.Rd
new file:   man/setValue-character-ANY-environment-character-environment-call-method.Rd
new file:   man/setValue-character-ANY-environment-character-environment-function-method.Rd
new file:   man/setValue-character-ANY-environment-character-environment-missing-method.Rd
new file:   man/setValue-character-ANY-environment-character-missing-call-method.Rd
new file:   man/setValue-character-ANY-environment-character-missing-function-method.Rd
new file:   man/setValue-character-ANY-environment-character-missing-missing-method.Rd
new file:   man/setValue-character-ANY-environment-missing-environment-call-method.Rd
new file:   man/setValue-character-ANY-environment-missing-environment-missing-method.Rd
new file:   man/setValue-character-ANY-environment-missing-missing-missing-method.Rd
new file:   man/setValue-character-ANY-missing-character-missing-call-method.Rd
new file:   man/setValue-character-ANY-missing-character-missing-function-method.Rd
new file:   man/setValue-character-ANY-missing-character-missing-missing-method.Rd
new file:   man/setValue-character-ANY-missing-missing-missing-missing-method.Rd
new file:   man/setValue.Rd
new file:   man/setValue_bare.Rd
:wq