Fix a few typos in newly added REST Client doc #43432

Job	Run time
Attach pull request number	2s
Initial JDK 17 Build	13m 44s
CI Sanity Check	31s
Calculate Test Jobs	9s
JVM Tests - JDK 17	1h 3m 21s
JVM Tests - JDK 21	1h 4m 13s
Devtools Tests - JDK ${{ matrix.java.name }}	0s
Gradle Tests - JDK ${{ matrix.java.name }}	0s
JVM Tests - JDK 17 Windows	59m 48s
Kubernetes Tests - JDK ${{ matrix.java.name }}	0s
Quickstarts Compilation - JDK 17	6m 52s
Maven Tests - JDK ${{ matrix.java.name }}	0s
Native Tests - Main	9m 43s
Native Tests - Data3	5m 9s
MicroProfile TCKs Tests	31m 22s
Native Tests - Data4	14m 27s
Native Tests - Messaging1	24m 8s
Native Tests - Virtual Thread - Main	3m 24s
Native Tests - Security2	20m 49s
Native Tests - Virtual Thread - Messaging	10m 26s
Native Tests - Security3	10m 56s
Native Tests - Cache	11m 20s
Native Tests - HTTP	23m 30s
Native Tests - Misc1	9m 3s
Native Tests - Misc3	13m 22s
Native Tests - Misc4	24m 57s
Native Tests - gRPC	5m 26s
Upload build stats to collector	0s
Build report	34s
	7h 7m 16s

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