Fixing Typographical Errors in Documentation (#7032)

README.md

@@ -55,7 +55,7 @@ Cairo is the first Turing-complete language for creating provable programs for g
 rustup override set stable && rustup update
 ```
 
-Ensure rust was installed correctly by running the following from the root project directory:
+Ensure Rust was installed correctly by running the following from the root project directory:
 ```bash
 cargo test
 ```
@@ -105,7 +105,7 @@ You can track the exact progress [here](./docs/FEATURE_PARITY.md).
 
 ## Support
 
-- We encourage developers to ask and answer questions on [stackoverflow](https://stackoverflow.com/questions/tagged/cairo-lang).
+- We encourage developers to ask and answer questions on [Stack Overflow](https://stackoverflow.com/questions/tagged/cairo-lang).
 - Contact options listed on [this GitHub profile](https://github.com/starkware-libs)
 
 ## Project assistance

crates/cairo-lang-defs/src/plugin.rs

@@ -95,7 +95,7 @@ pub struct MacroPluginMetadata<'a> {
     pub edition: Edition,
 }
 
-// TOD(spapini): Move to another place.
+// TODO(spapini): Move to another place.
 /// A trait for a macro plugin: external plugin that generates additional code for items.
 pub trait MacroPlugin: std::fmt::Debug + Sync + Send {
     /// Generates code for an item. If no code should be generated returns None.