fix(tools) Fixed documentation comments on different .js files (#38642)

tools/dashboard/lib/utils/rate-limiter.js

@@ -1,5 +1,5 @@
 const rateLimiter = (delay = 1500) => {
-  /* The 1500 delay will guarntee the script will not exceed Github request
+  /* The 1500 delay will guarantee the script will not exceed Github request
     limit of 1500 per hour. Only increase if you have a higher rate limit */
   return new Promise(resolve => setTimeout(() => resolve(true), delay));
 };

tools/dashboard/one-off-scripts/comments-and-labels-summary.js

@@ -3,7 +3,7 @@ This is a one-off script that was was used to summarize the results of a
 test_sweeper json log file after sweeper.js was run on a particular set of data.
 It generates a text file referencing only PRs with any comments/labels
 which would have beeen added (test) based on data stored in the
-specific JSON log file.  You must run sweeper with environement variable
+specific JSON log file. You must run sweeper with environment variable
 PRODUCTION_RUN set to false, to get the test version.  Technically, you
 could also run this on a production_sweeper json log file, if you wanted to see
 if the sweeper commented or labeled any PRs during its run.

tools/dashboard/probot/server/presolver.js

@@ -97,7 +97,7 @@ class Presolver {
     const number = this.pullRequest.number;
     const label = this.config.labelPRConflict;
     const github = this.github;
-    // Check if a label does not exist. If it does, it addes the label.
+    // Check if a label does not exist. If it does, it adds label.
     return this._getLabel(label).catch(() => {
       // console.log(labelObj)
       return github.issues.addLabels({