Update nested serialization docs
Fix docs typo
pedantic doc updates
Merge pull request #991 from ericbuehl/master

pedantic doc updates
Modified documentation for CSRF as mentioned in #984
Merge pull request #993 from kevin-brown/issue_984_docs

Made the CSRF documentation more clear
Merge pull request #985 from maspwr/writable-nested-modelserializer-docs

Update nested serialization docs
Merge remote-tracking branch 'upstream/writable-nested-modelserializer' into writable-nested-modelserializer
Merge remote-tracking branch 'upstream/master' into writable-nested-modelserializer