Lead with "Zcash is HTTPS for money" in both the README and the Debian

package description. (This also fixes a typo in the latter.)

Signed-off-by: Daira Emma Hopwood <[email protected]>

README.md

@@ -5,12 +5,14 @@ Zcash 5.8.0
 What is Zcash?
 --------------
 
-[Zcash](https://z.cash/) is an implementation of the "Zerocash" protocol.
-Initially based on Bitcoin's design, Zcash intends to offer a far
-higher standard of privacy through a sophisticated zero-knowledge
-proving scheme that preserves confidentiality of transaction
-metadata. More technical details are available in our [Protocol
-Specification](https://zips.z.cash/protocol/protocol.pdf).
+[Zcash](https://z.cash/) is HTTPS for money.
+
+Initially based on Bitcoin's design, Zcash has been developed from
+the Zerocash protocol to offer a far higher standard of privacy and
+anonymity. It uses a sophisticated zero-knowledge proving scheme to
+preserve confidentiality and hide the connections between shielded
+transactions. More technical details are available in our
+[Protocol Specification](https://zips.z.cash/protocol/protocol.pdf).
 
 ## The `zcashd` Full Node
 

contrib/debian/control

@@ -13,10 +13,11 @@ Vcs-Browser: https://github.com/zcash/zcash
 Package: zcash
 Architecture: amd64
 Depends: ${shlibs:Depends}
-Description: Zcash libraries and tools
- Based on Bitcoin's code, it intends to offer a far higher standard
- of privacy and anonymity through a sophisticiated zero-knowledge
- proving scheme which preserves confidentiality of transaction metadata.
- Think of it as HTTPS for money.
- This package provides the daemon, zcashd, and the CLI tool,
- zcash-cli, to interact with the daemon.
+Description: Zcash is HTTPS for money
+ Initially based on Bitcoin's design, Zcash has been developed from
+ the Zerocash protocol to offer a far higher standard of privacy and
+ anonymity. It uses a sophisticated zero-knowledge proving scheme to
+ preserve confidentiality and hide the connections between shielded
+ transactions.
+ This package provides the daemon, zcashd, and a CLI tool, zcash-cli,
+ to interact with the daemon.