(DOCSP-43739) Standardize FCV (#180)

Author: elyse-mdb

source/mongorestore/mongorestore-behavior-access-usage.txt

@@ -57,7 +57,7 @@ Rebuild Indexes
 
 .. note::
 
-   For MongoDB installations with ``featureCompatibilityVersion`` (fCV)
+   For MongoDB installations with ``featureCompatibilityVersion`` (FCV)
    set to ``"4.0"`` or earlier, creating indexes will
    error if an index key in an existing document exceeds the
    limit.