fix single measurement sha256 (no newline)

README.md

@@ -8,12 +8,19 @@ WIP Toolbox
 - [Client allowing only server using the custom TLS certificate](cmd/https-client/main.go)
 - [Status API server, with ability for recording and querying events](cmd/status-api/)
 
-Canonical way to collapse a TDX [measurements.json](docs/measurements.json) file into a single hash, in a reproducible way:
+---
+
+## Collapsing a TDX measurements JSON object into a single SHA256 hash
+
+This is our canonical method to collapse a full TDX [measurements JSON object](docs/measurements.json) into a single SHA256 hash, in a reproducible way (sort keys, remove whitespace, print without newline):
 
 ```bash
-cat measurements.json | jq --sort-keys --compact-output | sha256sum
+cat docs/measurements.json | jq --sort-keys --compact-output --join-output | sha256sum
+59952c2557da91cdafb9361d41d6971fc2b0be1a85ad57134e38714b266ff581  -
 ```
 
+---
+
 ## Usage
 
 ```bash