Update description of skipStartupWarnings flag

Co-authored-by: Anna Henningsen <[email protected]>

Author: dlombard

README.md

@@ -44,7 +44,7 @@ variable. For detailed instructions for each of our supported platforms, please
         --eval [arg]                           Evaluate javascript
         --json[=canonical|relaxed]             Print result of --eval as Extended JSON, including errors
         --retryWrites[=true|false]             Automatically retry write operations upon transient network errors (Default: true)
-        --skipStartupWarnings                  Hides the startup warnings
+        --skipStartupWarnings                  Do not display server startup warnings
 
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