docs: fix some typos (#1562)

Co-authored-by: Sean McArthur <sean@seanmonstar.com>

src/async_impl/response.rs

@@ -127,7 +127,7 @@ impl Response {
     ///
     /// This method decodes the response body with BOM sniffing
     /// and with malformed sequences replaced with the REPLACEMENT CHARACTER.
-    /// Encoding is determinated from the `charset` parameter of `Content-Type` header,
+    /// Encoding is determined from the `charset` parameter of `Content-Type` header,
     /// and defaults to `utf-8` if not presented.
     ///
     /// # Example

src/blocking/response.rs

@@ -267,7 +267,7 @@ impl Response {
     ///
     /// This method decodes the response body with BOM sniffing
     /// and with malformed sequences replaced with the REPLACEMENT CHARACTER.
-    /// Encoding is determinated from the `charset` parameter of `Content-Type` header,
+    /// Encoding is determined from the `charset` parameter of `Content-Type` header,
     /// and defaults to `utf-8` if not presented.
     ///
     /// # Example

src/wasm/body.rs

@@ -75,7 +75,7 @@ impl Body {
         }
     }
 
-    /// into_part turns a regular body into the body of a mutlipart/form-data part.
+    /// into_part turns a regular body into the body of a multipart/form-data part.
     #[cfg(feature = "multipart")]
     pub(crate) fn into_part(self) -> Body {
         match self.inner {