Update packages/pa_ppx_parsetree/pa_ppx_parsetree.0.01/opam

Author: avsm

packages/pa_ppx_parsetree/pa_ppx_parsetree.0.01/opam

@@ -1,7 +1,7 @@
 synopsis: "A Camlp5-based Quasi-Quotation ppx rewriter for OCaml's AST "
 description:
 """
-Thsi package provides quasi-quotations (like ppx_metaquot)
+This package provides quasi-quotations (like ppx_metaquot)
 for the OCaml AST, so you can write code that computes over
 OCaml's AST, using human-readable surface syntax for
 patterns and expressions.