[ja_JP] Introduction

Original HTML: https://hyperledger-fabric.readthedocs.io/en/release-2.5/whatis.html
Original Source: https://github.com/hyperledger/fabric/blob/e1e8e2e52aa4fc543360d245fe6554a0eaf81183/docs/source/whatis.md

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diff --git a/docs/source/whatis.md b/docs/source/whatis.md
index a38cce640..b37a1c3ae 100644
--- a/docs/source/whatis.md
+++ b/docs/source/whatis.md
@@ -297,12 +297,7 @@ requirements.
## Performance and Scalability

Performance of a blockchain platform can be affected by many variables such as
-transaction size, block size, network size, as well as limits of the hardware,
-etc. The Hyperledger Fabric [Performance and Scale working group](https://wiki.hyperledger.org/display/PSWG/Performance+and+Scale+Working+Group)
-currently works on a benchmarking framework called [Hyperledger Caliper](https://wiki.hyperledger.org/projects/caliper).
-
-Several research papers have been published studying and testing the performance
-capabilities of Hyperledger Fabric. The latest [scaled Fabric to 20,000 transactions per second](https://arxiv.org/abs/1901.00910).
+transaction size, block size, network size, as well as available hardware resources such as CPU, Memory, Disk Space, Disk and network I/O.

## Conclusion

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Start with docs/source/whatis.md at the referenced commit and compare its Performance and Scalability section with the ja_JP Introduction translation. Update the Japanese page to reflect the shown source changes, then verify that the translated section matches the current English content.

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