Fix left chunks and right chunks typing. (#20567)
Fix left chunks and right chunks typing. (#20567)

leftChunks() and rightChunks() returns an array of MergeViewDiffChunk.
mcliment/DefinitelyTyped,georgemarshall/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,laurentiustamate94/DefinitelyTyped,jimthedev/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,AgentME/DefinitelyTyped,arusakov/DefinitelyTyped,one-pieces/DefinitelyTyped,dsebastien/DefinitelyTyped,benishouga/DefinitelyTyped,AgentME/DefinitelyTyped,magny/DefinitelyTyped,markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,jimthedev/DefinitelyTyped,jimthedev/DefinitelyTyped,alexdresko/DefinitelyTyped,borisyankov/DefinitelyTyped,aciccarello/DefinitelyTyped,aciccarello/DefinitelyTyped,zuzusik/DefinitelyTyped,chrootsu/DefinitelyTyped,AbraaoAlves/DefinitelyTyped,benishouga/DefinitelyTyped,benliddicott/DefinitelyTyped,alexdresko/DefinitelyTyped,borisyankov/DefinitelyTyped,arusakov/DefinitelyTyped,magny/DefinitelyTyped,benishouga/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,rolandzwaga/DefinitelyTyped,zuzusik/DefinitelyTyped,AgentME/DefinitelyTyped,rolandzwaga/DefinitelyTyped,chrootsu/DefinitelyTyped,arusakov/DefinitelyTyped,aciccarello/DefinitelyTyped,zuzusik/DefinitelyTyped,AgentME/DefinitelyTyped