Update README.md

Proposed changes to the README file in the `ocaml-ppx/ppxlib` repository.
Signed-off-by: Mario <[email protected]>

README.md

@@ -12,13 +12,13 @@
 # Overview
 
 Ppxlib is the standard library for ppx rewriters and other programs
-that manipulate the in-memory representation of OCaml programs, a.k.a
+that manipulate the in-memory representation of OCaml programs, a.k.a.
 the "Parsetree".
 
 It also comes bundled with two ppx rewriters that are commonly used to
-write tools that manipulate and/or generate Parsetree values;
-`ppxlib.metaquot` which allows to construct Parsetree values using the
-OCaml syntax directly and `ppxlib.traverse` which provides various
+write tools that manipulate and/or generate Parsetree values:
+`ppxlib.metaquot`, which allows constructing Parsetree values using the
+OCaml syntax directly, and `ppxlib.traverse`, which provides various
 ways of automatically traversing values of a given type, in particular
 allowing to inject a complex structured value into generated code.
 
@@ -27,11 +27,11 @@ For more information about ppxlib and how to use it, please consult the
 
 # What is the relation between ppxlib and other ppx libraries?
 
-The ppx world has a long historied history, and if you look around you
+The ppx world has a long and storied history, and if you look around, you
 may find other projects that offer functionalities similar to
 ppxlib. The following [blog post][future-of-ppx] gives a good overview
 of the various libraries that have been developed over time. At this
-point, ppxlib is considered as the de facto library for writing ppx
+point, ppxlib is considered the de facto library for writing ppx
 rewriters.
 
 # History of the project