Documentation: fix incorrect release date for R87 (close #3126)
Documentation: fix incorrect release date for R87 (close #3126)

snowplow/snowplow,haensel-ams/snowplow,Propertyfinder/snowplow,sspinc/snowplow,sspinc/snowplow,haensel-ams/snowplow,acgray/snowplow,Propertyfinder/snowplow,Propertyfinder/snowplow,aldemirenes/snowplow,snowplow/snowplow,RetentionGrid/snowplow,haensel-ams/snowplow,haensel-ams/snowplow,acgray/snowplow,acgray/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,aldemirenes/snowplow,RetentionGrid/snowplow,RetentionGrid/snowplow,snowplow/snowplow,haensel-ams/snowplow,aldemirenes/snowplow,sspinc/snowplow,RetentionGrid/snowplow,snowplow/snowplow,liveintent-berlin/snowplow,acgray/snowplow,acgray/snowplow,liveintent-berlin/snowplow,aldemirenes/snowplow,RetentionGrid/snowplow,acgray/snowplow,sspinc/snowplow,aldemirenes/snowplow,haensel-ams/snowplow,aldemirenes/snowplow,sspinc/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,liveintent-berlin/snowplow,Propertyfinder/snowplow,liveintent-berlin/snowplow