TEZ-2578. Update docs for 0.5.4 release
TEZ-2578. Update docs for 0.5.4 release

sidseth/tez,guiling/tez,bernhardschaefer/tez,ueshin/apache-tez,bernhardschaefer/tez,navis/tez,jth/tez,sidseth/tez,ueshin/apache-tez,navis/tez,Parth-Brahmbhatt/tez,ChetnaChaudhari/tez,apache/tez,ueshin/apache-tez,apache/tez,navis/tez,ChetnaChaudhari/tez,bernhardschaefer/tez,guiling/tez,sidseth/tez,apache/tez,apache/tez,bernhardschaefer/tez,dongjiaqiang/tez,Parth-Brahmbhatt/tez,dongjiaqiang/tez,navis/tez,navis/tez,bernhardschaefer/tez,ChetnaChaudhari/tez,jth/tez,Parth-Brahmbhatt/tez,jth/tez,ChetnaChaudhari/tez,Parth-Brahmbhatt/tez,jth/tez,ueshin/apache-tez,dongjiaqiang/tez,sidseth/tez,dongjiaqiang/tez,guiling/tez,sidseth/tez,ChetnaChaudhari/tez,guiling/tez,ueshin/apache-tez,Parth-Brahmbhatt/tez,jth/tez,guiling/tez,apache/tez,dongjiaqiang/tez