ARROW-995: [Website] Fix a typo
ARROW-995: [Website] Fix a typo

Author: Kouhei Sutou <kou@clear-code.com>

Closes #667 from kou/site-fix-a-typo and squashes the following commits:

dc66a18 [Kouhei Sutou] [Website] Fix a typo

laurentgo/arrow,wagavulin/arrow,yufeldman/arrow,icexelloss/arrow,xhochy/arrow,kou/arrow,laurentgo/arrow,tebeka/arrow,yufeldman/arrow,laurentgo/arrow,renesugar/arrow,dremio/arrow,itaiin/arrow,NonVolatileComputing/arrow,icexelloss/arrow,icexelloss/arrow,renesugar/arrow,cpcloud/arrow,laurentgo/arrow,jeffknupp/arrow,tebeka/arrow,apache/arrow,xhochy/arrow,apache/arrow,dremio/arrow,jeffknupp/arrow,majetideepak/arrow,NonVolatileComputing/arrow,wagavulin/arrow,kou/arrow,laurentgo/arrow,NonVolatileComputing/arrow,cpcloud/arrow,majetideepak/arrow,itaiin/arrow,tebeka/arrow,dremio/arrow,apache/arrow,kou/arrow,NonVolatileComputing/arrow,tebeka/arrow,majetideepak/arrow,pcmoritz/arrow,icexelloss/arrow,xhochy/arrow,pcmoritz/arrow,cpcloud/arrow,cpcloud/arrow,cpcloud/arrow,yufeldman/arrow,wesm/arrow,wagavulin/arrow,pcmoritz/arrow,wesm/arrow,itaiin/arrow,itaiin/arrow,pcmoritz/arrow,kou/arrow,wagavulin/arrow,wesm/arrow,majetideepak/arrow,icexelloss/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,dremio/arrow,wagavulin/arrow,apache/arrow,renesugar/arrow,majetideepak/arrow,yufeldman/arrow,apache/arrow,tebeka/arrow,tebeka/arrow,itaiin/arrow,wesm/arrow,renesugar/arrow,yufeldman/arrow,siddharthteotia/arrow,dremio/arrow,renesugar/arrow,jeffknupp/arrow,itaiin/arrow,pcmoritz/arrow,jeffknupp/arrow,siddharthteotia/arrow,NonVolatileComputing/arrow,siddharthteotia/arrow,pcmoritz/arrow,renesugar/arrow,cpcloud/arrow,dremio/arrow,itaiin/arrow,dremio/arrow,icexelloss/arrow,apache/arrow,wesm/arrow,NonVolatileComputing/arrow,renesugar/arrow,xhochy/arrow,laurentgo/arrow,NonVolatileComputing/arrow,pcmoritz/arrow,icexelloss/arrow,laurentgo/arrow,jeffknupp/arrow,apache/arrow,xhochy/arrow,tebeka/arrow,majetideepak/arrow,laurentgo/arrow,wagavulin/arrow,tebeka/arrow,wesm/arrow,itaiin/arrow,xhochy/arrow,apache/arrow,xhochy/arrow,kou/arrow,wesm/arrow,xhochy/arrow,pcmoritz/arrow,cpcloud/arrow,kou/arrow,xhochy/arrow,wesm/arrow,wesm/arrow,kou/arrow,icexelloss/arrow,pcmoritz/arrow,wagavulin/arrow,cpcloud/arrow,xhochy/arrow,yufeldman/arrow,majetideepak/arrow,kou/arrow,icexelloss/arrow,itaiin/arrow,siddharthteotia/arrow,icexelloss/arrow,itaiin/arrow,majetideepak/arrow,pcmoritz/arrow,siddharthteotia/arrow,siddharthteotia/arrow,renesugar/arrow,kou/arrow,jeffknupp/arrow,yufeldman/arrow,xhochy/arrow,xhochy/arrow,tebeka/arrow,pcmoritz/arrow,apache/arrow,cpcloud/arrow,yufeldman/arrow,renesugar/arrow,laurentgo/arrow,majetideepak/arrow,siddharthteotia/arrow,itaiin/arrow,xhochy/arrow,jeffknupp/arrow,icexelloss/arrow,yufeldman/arrow,icexelloss/arrow,wesm/arrow,majetideepak/arrow,NonVolatileComputing/arrow,renesugar/arrow,kou/arrow,cpcloud/arrow,apache/arrow,wagavulin/arrow,dremio/arrow,laurentgo/arrow,kou/arrow,dremio/arrow,renesugar/arrow,NonVolatileComputing/arrow,kou/arrow,pcmoritz/arrow,siddharthteotia/arrow,apache/arrow,siddharthteotia/arrow,kou/arrow,apache/arrow,itaiin/arrow,renesugar/arrow,xhochy/arrow,pcmoritz/arrow,yufeldman/arrow,wesm/arrow,cpcloud/arrow,laurentgo/arrow,cpcloud/arrow,laurentgo/arrow,itaiin/arrow,cpcloud/arrow,icexelloss/arrow,renesugar/arrow,wagavulin/arrow,xhochy/arrow,wesm/arrow,wesm/arrow,jeffknupp/arrow,majetideepak/arrow,laurentgo/arrow,wagavulin/arrow,wagavulin/arrow,laurentgo/arrow,cpcloud/arrow,NonVolatileComputing/arrow,jeffknupp/arrow,renesugar/arrow,apache/arrow,icexelloss/arrow,renesugar/arrow,itaiin/arrow,siddharthteotia/arrow,itaiin/arrow,pcmoritz/arrow,pcmoritz/arrow,apache/arrow,wesm/arrow,majetideepak/arrow,dremio/arrow,majetideepak/arrow,wagavulin/arrow,kou/arrow,jeffknupp/arrow,tebeka/arrow,majetideepak/arrow,dremio/arrow,yufeldman/arrow,laurentgo/arrow,jeffknupp/arrow,majetideepak/arrow