docs(gazelle): Update README.md for gazelle (#1454)

Remove incompatible_generate_aliases from docs as its no longer
required.

gazelle/README.md

diff --git a/gazelle/README.md b/gazelle/README.md
index 4728e4c..b8be32f 100644
--- a/gazelle/README.md
+++ b/gazelle/README.md
@@ -64,9 +64,6 @@
 # operating systems, we have requirements for each.
 pip.parse(
     name = "pip",
-    # When using gazelle you must use set the following flag
-    # in order for the generation of gazelle dependency resolution.
-    incompatible_generate_aliases = True,
     requirements_lock = "//:requirements_lock.txt",
     requirements_windows = "//:requirements_windows.txt",
 )