minor doc fix

[AhmedSoliman]

Typo + added a note to register the service with CLI

[github-actions]

Test Results

 50 files  ±0   50 suites  ±0   6m 39s ⏱️ -15s
758 tests  - 1  751 ✅  - 1  7 💤 ±0  0 ❌ ±0 
759 runs  ±0  752 ✅ ±0  7 💤 ±0  0 ❌ ±0 

Results for commit bddb6d2. ± Comparison against base commit de2f240.

This pull request removes 7 and adds 6 tests. Note that renamed tests count towards both.

dev.restate.sdk.TestSerdesTest ‑ Byte: 126
dev.restate.sdk.TestSerdesTest ‑ Double: 0.7386553490205815
dev.restate.sdk.TestSerdesTest ‑ Float: 0.48645276
dev.restate.sdk.TestSerdesTest ‑ Integer: 562222331
dev.restate.sdk.TestSerdesTest ‑ Long: 356782261325852552
dev.restate.sdk.TestSerdesTest ‑ Short: 28262
dev.restate.sdk.serde.jackson.JacksonSerdesTest ‑ [Till, Francesco]

dev.restate.sdk.TestSerdesTest ‑ Byte: 78
dev.restate.sdk.TestSerdesTest ‑ Double: 0.41804452727254193
dev.restate.sdk.TestSerdesTest ‑ Float: 0.19167376
dev.restate.sdk.TestSerdesTest ‑ Integer: -1586787368
dev.restate.sdk.TestSerdesTest ‑ Long: 7141125038743746104
dev.restate.sdk.TestSerdesTest ‑ Short: -13892