[pkgsite] tests: update docs for updating screenshot tests

[Ethan Lee (Gerrit)]

Ethan Lee submitted the change with unreviewed changes

Unreviewed changes

1 is the latest approved patch-set.
The change was submitted with unreviewed changes in the following files:

```
The name of the file: tests/README.md
Insertions: 3, Deletions: 2.

@@ -98,8 +98,9 @@
 
 Update screen shot diffs using the following:
 
-1. Run `./tests/screentest/run.sh ci -update` to collect the updated screenshots.
-2. Copy the new screenshots from `./tests/screentest/output` into `./tests/screentest/testdata/testcases`
+1. Run `./tests/screentest/run.sh -update ci` to collect the updated screenshots.
+2. Optionally use `./tests/screentest/run.sh -update -run <test> ci` to update specific tests.
+3. Copy the new screenshots from `./tests/screentest/output` into `./tests/screentest/testdata/testcases`
 
 ### Understanding Test Failures
 
```

Change information

Commit message:

tests: update docs for updating screenshot tests

Change-Id: I85997dce21dae9c40ca68eb4007e7a724e519094

Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/731021

Reviewed-by: Jonathan Amsterdam <j...@google.com>

LUCI-TryBot-Result: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

kokoro-CI: kokoro <noreply...@google.com>

Auto-Submit: Ethan Lee <etha...@google.com>

Files:

• M tests/README.md

Change size: XS

Delta: 1 file changed, 8 insertions(+), 0 deletions(-)

Branch: refs/heads/master

Submit Requirements:

• Code-Review: +2 by Jonathan Amsterdam
• TryBots-Pass: LUCI-TryBot-Result+1 by Go LUCI
• kokoro-CI-Passes: kokoro-CI+1 by kokoro

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Gerrit

Gerrit-MessageType: merged

Gerrit-Project: pkgsite

Gerrit-Branch: master

Gerrit-Change-Id: I85997dce21dae9c40ca68eb4007e7a724e519094

Gerrit-Change-Number: 731021

Gerrit-PatchSet: 9

Gerrit-Owner: Ethan Lee <etha...@google.com>

Gerrit-Reviewer: Ethan Lee <etha...@google.com>

Gerrit-Reviewer: Go LUCI <golang...@luci-project-accounts.iam.gserviceaccount.com>

Gerrit-Reviewer: Jonathan Amsterdam <j...@google.com>

Gerrit-Reviewer: kokoro <noreply...@google.com>

Gerrit-CC: kokoro <noreply...@google.com>