indexeddb: fix typo in comment (#8604)

Author: alxndrsn

packages/node_modules/pouchdb-adapter-indexeddb/src/setup.js

@@ -26,7 +26,7 @@ var POUCHDB_IDB_VERSION = 1;
 //  - or 89 system migrations up to 5050/02/14
 //
 // This impl does the former. If this code still exists after 2198 someone send my
-// decendents a Spacebook message congratulating them on their impressive genes.
+// descendants a Spacebook message congratulating them on their impressive genes.
 //
 // 9007199254740991 <- MAX_SAFE_INTEGER
 //   10000000000000 <- 10^13