Documentation typo error fix in test_summary option.

Fixes : https://github.com/bazelbuild/bazel/issues/15058
PiperOrigin-RevId: 440270819

src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java

diff --git a/src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java b/src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java
index 5972767..cb22ee3 100644
--- a/src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java
+++ b/src/main/java/com/google/devtools/build/lib/exec/ExecutionOptions.java
@@ -281,7 +281,7 @@
       documentationCategory = OptionDocumentationCategory.LOGGING,
       effectTags = {OptionEffectTag.TERMINAL_OUTPUT},
       help =
-          "Specifies the desired format ot the test summary. Valid values are 'short' to print "
+          "Specifies the desired format of the test summary. Valid values are 'short' to print "
               + "information only about tests executed, 'terse', to print information only about "
               + "unsuccessful tests that were run, 'detailed' to print detailed information about "
               + "failed test cases, and 'none' to omit the summary.")