symlink.py: Remove an "unused variable f" lint warning

While here, very minor help text refresh.

No behavior change.

Bug: none
Change-Id: I7914106d12c1e6845dd0b5a2dfc6e2d054b2ed39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2782782
Auto-Submit: Nico Weber <[email protected]>
Commit-Queue: Nico Weber <[email protected]>
Reviewed-by: Andrew Grieve <[email protected]>
Cr-Commit-Position: refs/heads/master@{#867079}
diff --git a/build/symlink.py b/build/symlink.py
index 6c0586b..0f90696 100755
--- a/build/symlink.py
+++ b/build/symlink.py
@@ -7,15 +7,14 @@
 Make a symlink and optionally touch a file (to handle dependencies).
 """
 usage = "%prog [options] source[ source ...] linkname"
-epilog = """
-A sym link to source is created at linkname. If multiple sources are specfied,
+epilog = """\
+A symlink to source is created at linkname. If multiple sources are specified,
 then linkname is assumed to be a directory, and will contain all the links to
 the sources (basenames identical to their source).
 
 On Windows, this will use hard links (mklink /H) to avoid requiring elevation.
 This means that if the original is deleted and replaced, the link will still
-have the old contents. This is not expected to interfere with the Chromium
-build.
+have the old contents.
 """
 
 import errno
@@ -84,7 +83,7 @@
 
 
   if options.touch:
-    with open(options.touch, 'w') as f:
+    with open(options.touch, 'w'):
       pass