Update SUMMARY.md

Update README.md

Author: vtjl10

tests/mir-opt/pre-codegen/README.md

@@ -1,3 +1,3 @@
-The goal of this directory is to track the quality of MIR that is given to codegen in a standard `-O` condiguration.
+The goal of this directory is to track the quality of MIR that is given to codegen in a standard `-O` configuration.
 
 As such, feel free to `--bless` whatever changes you get here, so long as doing so doesn't add substantially more MIR.

tests/ui/SUMMARY.md

@@ -410,7 +410,7 @@ These tests revolve around command-line flags which change the way error/warning
 
 ## `tests/ui/diagnostic_namespace/`
 
-Exercises `#[diagnostic::*]` namespaced attributes. See [RFC 3368 Diagnostic attribute namepsace](https://github.com/rust-lang/rfcs/blob/master/text/3368-diagnostic-attribute-namespace.md).
+Exercises `#[diagnostic::*]` namespaced attributes. See [RFC 3368 Diagnostic attribute namespace](https://github.com/rust-lang/rfcs/blob/master/text/3368-diagnostic-attribute-namespace.md).
 
 ## `tests/ui/diagnostic-width/`: `--diagnostic-width`