chore: update variable names to be consistent with elsewhere

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
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    status: na
  - task: lint_javascript_cli
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  - task: lint_javascript_examples
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  - task: lint_javascript_tests
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  - task: lint_python
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  - task: lint_c_src
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  - task: lint_c_examples
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  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
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  - task: lint_license_headers
    status: passed
---

Author: kgryte

lib/node_modules/@stdlib/blas/base/ccopy/benchmark/fortran/benchmark.length.f

@@ -117,8 +117,8 @@ double precision function benchmark( iterations, len )
     ! ..
     ! External functions:
     interface
-      subroutine ccopy( N, cx, strideX, cy, strideY )
-        complex :: cx(*), cy(*)
+      subroutine ccopy( N, x, strideX, y, strideY )
+        complex :: x(*), y(*)
         integer :: strideX, strideY, N
       end subroutine ccopy
     end interface
@@ -207,4 +207,4 @@ subroutine main()
     end do
     call print_summary( count, count )
   end subroutine main
-end program bench
+end program bench