Update src/dls_bluesky_core/plans/__init__.py

Co-authored-by: Callum Forrester <callum.forrester@diamond.ac.uk>

src/dls_bluesky_core/plans/__init__.py

@@ -2,7 +2,7 @@
 from .wrapped import count
 
 """
-This package is intended to hold MsgGenerator functions which as self-contained blocks:
+This package is intended to hold MsgGenerator functions which act as self-contained blocks:
 start runs, collect data, and close the runs. While they may be used as building blocks
 for larger nested plans, they are primarily intended to be run as-is, and any common
 functionality which may be useful to multiple plans extracted to stubs/.