Fixing as per @zoep

Author: msooseth

doc/src/equivalence.md

@@ -48,6 +48,6 @@ hevm equivalence \
 ```
 If `--sig` is given, calldata is assumed to take the form of the function
 given. If `--calldata` is provided, a specific, concrete calldata is used. If
-neither is provided, calldata of at most `2**64` byte is assumed. Note that a
-`2**64` byte calldata would go over the gas limit, and hence should cover all
-meaningful cases.
+neither is provided, a fully abstract calldata of at most `2**64` byte is
+assumed. Note that a `2**64` byte calldata would go over the gas limit, and
+hence should cover all meaningful cases.