Replace “interface” with “viewer” in description

Previously, we called rusty-man a command-line interface for rustdoc
documentation, but “viewer” is a more appropriate term.

Cargo.toml

@@ -6,7 +6,7 @@ name = "rusty-man"
 version = "0.1.0"
 authors = ["Robin Krahl <robin.krahl@ireas.org>"]
 edition = "2018"
-description = "Command-line interface for rustdoc documentation"
+description = "Command-line viewer for rustdoc documentation"
 keywords = ["doc", "cli", "rustdoc"]
 categories = ["command-line-utilities"]
 readme = "README.md"

README.md

@@ -5,7 +5,7 @@ SPDX-License-Identifier: MIT
 
 # rusty-man
 
-A command-line interface for documentation generated by `rustdoc`.
+A command-line viewer for documentation generated by `rustdoc`.
 
 ## Minimum Supported Rust Version