fix duplicate words of runtime controller desc

[wan92hen]

Description

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #661 (c540113) into master (d4b48df) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #661   +/-   ##
=========================================
  Coverage     55.34%   55.34%           
- Complexity    10187    10189    +2     
=========================================
  Files          1046     1046           
  Lines         64430    64430           
  Branches       7306     7306           
=========================================
+ Hits          35657    35659    +2     
  Misses        26264    26264           
+ Partials       2509     2507    -2     

Impacted Files	Coverage Δ	Complexity Δ
...n/java/org/apache/jmeter/reporters/Summariser.java	85.49% <0.00%> (+0.76%)	18.00% <0.00%> (+1.00%)
...ache/jmeter/reporters/SummariserRunningSample.java	85.07% <0.00%> (+1.49%)	19.00% <0.00%> (+1.00%)

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[FSchumacher]

Thanks for the fix