Update retry-error README

retry-error/README.md

-# tor-retry
+# retry-error
 
-Helpers to implement retry-related functionality.
+An error attempt to represent multiple failures.
 
-Right now, this crate only has an error type that we use when we
-retry something a few times, and they all fail.  Instead of
+This crate implements [`RetryError`], a type to use when you
+retry something a few times, and all those attempts.  Instead of
 returning only a single error, it records _all of the errors
-received, in case they are different.
+received_, in case they are different.
 
-This crate is part of
+This crate is developed as part of
 [Arti](https://gitlab.torproject.org/tpo/core/arti/), a project to
 implement [Tor](https://www.torproject.org/) in Rust.
 It's used by higher-level crates that retry
 operations.
 
-### Design notes
-
-XXXX We'll want to refactor this one.  It might be better in a
-crate called retry-error or something, since it isn't
-tor-specific.
-
-The [`RetryError`] type might be more generally useful in the
-future, if it gets a stable interface, and if we can make it stop
-depending on [`anyhow`].
-
-Maybe this error type should be parameterized on an input error type.
-
 ## Example
 
 ```rust
-use tor_retry::RetryError;
+use retry_error::RetryError;
 
 const N_ATTEMPTS: usize = 10;
-let mut err = RetryError::while_doing("perform an example operation");
+let mut err = RetryError::in_attempt_to("perform an example operation");
 for _ in 0..N_ATTEMPTS {
     match some_operation() {
         Ok(val) => return Ok(val),