docs(typo): remove extra quotation

[joshxfi]

https://the-guild.dev/graphql/yoga-server/docs/features/response-caching#enforce-session-based-caching

- 'User: 'PRIVATE' // Unterminated string literal.
+ User: 'PRIVATE'

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Latest commit: af351c0cdcb884e585ce7d92474d243a4835243d

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[github-actions[bot]]

✅ Benchmark Results

     ✓ no_errors{mode:graphql}
     ✓ expected_result{mode:graphql}
     ✓ no_errors{mode:graphql-jit}
     ✓ expected_result{mode:graphql-jit}
     ✓ no_errors{mode:graphql-response-cache}
     ✓ expected_result{mode:graphql-response-cache}
     ✓ no_errors{mode:graphql-no-parse-validate-cache}
     ✓ expected_result{mode:graphql-no-parse-validate-cache}

     checks.......................................: 100.00% ✓ 426084     ✗ 0     
     data_received................................: 1.7 GB  14 MB/s
     data_sent....................................: 86 MB   717 kB/s
     http_req_blocked.............................: avg=1.42µs   min=992ns    med=1.29µs   max=418.91µs p(90)=1.83µs   p(95)=2.03µs  
     http_req_connecting..........................: avg=2ns      min=0s       med=0s       max=156.18µs p(90)=0s       p(95)=0s      
     http_req_duration............................: avg=354.29µs min=209.93µs med=318.3µs  max=23.97ms  p(90)=462.18µs p(95)=481.44µs
       { expected_response:true }.................: avg=354.29µs min=209.93µs med=318.3µs  max=23.97ms  p(90)=462.18µs p(95)=481.44µs
     ✓ { mode:graphql-jit }.......................: avg=276.93µs min=209.93µs med=256.16µs max=18.02ms  p(90)=286.23µs p(95)=297.66µs
     ✓ { mode:graphql-no-parse-validate-cache }...: avg=484.76µs min=402.45µs med=459.17µs max=10.91ms  p(90)=498.52µs p(95)=522.33µs
     ✓ { mode:graphql-response-cache }............: avg=334.19µs min=264.96µs med=315.96µs max=5.76ms   p(90)=347.95µs p(95)=358.19µs
     ✓ { mode:graphql }...........................: avg=359.96µs min=272.29µs med=328.52µs max=23.97ms  p(90)=371.47µs p(95)=403.08µs
     http_req_failed..............................: 0.00%   ✓ 0          ✗ 213042
     http_req_receiving...........................: avg=32.83µs  min=15.96µs  med=32.74µs  max=4.45ms   p(90)=37.84µs  p(95)=39.85µs 
     http_req_sending.............................: avg=7.94µs   min=6.01µs   med=7.1µs    max=291.04µs p(90)=10.57µs  p(95)=11.27µs 
     http_req_tls_handshaking.....................: avg=0s       min=0s       med=0s       max=0s       p(90)=0s       p(95)=0s      
     http_req_waiting.............................: avg=313.52µs min=178.56µs med=278.42µs max=23.85ms  p(90)=421.2µs  p(95)=438.37µs
     http_reqs....................................: 213042  1775.33006/s
     iteration_duration...........................: avg=558.55µs min=376.22µs med=518.56µs max=24.82ms  p(90)=670.84µs p(95)=694.86µs
     iterations...................................: 213042  1775.33006/s
     vus..........................................: 1       min=1        max=1   
     vus_max......................................: 2       min=2        max=2