fix(doc): TOML otel exporter example — multi-line inline table is inv… (#7669)

…alid (#7668)

The `otel` exporter example in `docs/config.md` is misleading and will
cause
the configuration parser to fail if copied verbatim.

Summary
-------
The example uses a TOML inline table but spreads the inline-table braces
across multiple lines. TOML inline tables must be contained on a single
line
(`key = { a = 1, b = 2 }`); placing newlines inside the braces triggers
a
parse error in most TOML parsers and prevents Codex from starting.

Reproduction
------------
1. Paste the snippet below into `~/.codex/config.toml` (or your project
config).
2. Run `codex` (or the command that loads the config).
3. The process will fail to start with a TOML parse error similar to:

```text
Error loading config.toml: TOML parse error at line 55, column 27
   |
55 | exporter = { otlp-http = {
   |                           ^
newlines are unsupported in inline tables, expected nothing
```

Problematic snippet (as currently shown in the docs)
---------------------------------------------------
```toml
[otel]
exporter = { otlp-http = {
  endpoint = "https://otel.example.com/v1/logs",
  protocol = "binary",
  headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" }
}}
```

Recommended fixes
------------------
```toml
[otel.exporter."otlp-http"]
endpoint = "https://otel.example.com/v1/logs"
protocol = "binary"

[otel.exporter."otlp-http".headers]
"x-otlp-api-key" = "${OTLP_TOKEN}"
```

Or, keep an inline table but write it on one line (valid but less
readable):

```toml
[otel]
exporter = { "otlp-http" = { endpoint = "https://otel.example.com/v1/logs", protocol = "binary", headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" } } }
```

docs/config.md

@@ -615,12 +615,12 @@ Set `otel.exporter` to control where events go:
   endpoint, protocol, and headers your collector expects:
 
   ```toml
-  [otel]
-  exporter = { otlp-http = {
-    endpoint = "https://otel.example.com/v1/logs",
-    protocol = "binary",
-    headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" }
-  }}
+  [otel.exporter."otlp-http"]
+  endpoint = "https://otel.example.com/v1/logs"
+  protocol = "binary"
+
+  [otel.exporter."otlp-http".headers]
+  "x-otlp-api-key" = "${OTLP_TOKEN}"
   ```
 
 - `otlp-grpc` – streams OTLP log records over gRPC. Provide the endpoint and any
@@ -628,27 +628,24 @@ Set `otel.exporter` to control where events go:
 
   ```toml
   [otel]
-  exporter = { otlp-grpc = {
-    endpoint = "https://otel.example.com:4317",
-    headers = { "x-otlp-meta" = "abc123" }
-  }}
+  exporter = { otlp-grpc = {endpoint = "https://otel.example.com:4317",headers = { "x-otlp-meta" = "abc123" }}}
   ```
 
 Both OTLP exporters accept an optional `tls` block so you can trust a custom CA
 or enable mutual TLS. Relative paths are resolved against `~/.codex/`:
 
 ```toml
-[otel]
-exporter = { otlp-http = {
-  endpoint = "https://otel.example.com/v1/logs",
-  protocol = "binary",
-  headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" },
-  tls = {
-    ca-certificate = "certs/otel-ca.pem",
-    client-certificate = "/etc/codex/certs/client.pem",
-    client-private-key = "/etc/codex/certs/client-key.pem",
-  }
-}}
+[otel.exporter."otlp-http"]
+endpoint = "https://otel.example.com/v1/logs"
+protocol = "binary"
+
+[otel.exporter."otlp-http".headers]
+"x-otlp-api-key" = "${OTLP_TOKEN}"
+
+[otel.exporter."otlp-http".tls]
+ca-certificate = "certs/otel-ca.pem"
+client-certificate = "/etc/codex/certs/client.pem"
+client-private-key = "/etc/codex/certs/client-key.pem"
 ```
 
 If the exporter is `none` nothing is written anywhere; otherwise you must run or point to your

docs/example-config.md

@@ -341,30 +341,28 @@ environment = "dev"
 exporter = "none"
 
 # Example OTLP/HTTP exporter configuration
-# [otel]
-# exporter = { otlp-http = {
-#   endpoint = "https://otel.example.com/v1/logs",
-#   protocol = "binary",                      # "binary" | "json"
-#   headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" }
-# }}
+# [otel.exporter."otlp-http"]
+# endpoint = "https://otel.example.com/v1/logs"
+# protocol = "binary"                         # "binary" | "json"
+
+# [otel.exporter."otlp-http".headers]
+# "x-otlp-api-key" = "${OTLP_TOKEN}"
 
 # Example OTLP/gRPC exporter configuration
-# [otel]
-# exporter = { otlp-grpc = {
-#   endpoint = "https://otel.example.com:4317",
-#   headers = { "x-otlp-meta" = "abc123" }
-# }}
+# [otel.exporter."otlp-grpc"]
+# endpoint = "https://otel.example.com:4317",
+# headers = { "x-otlp-meta" = "abc123" }
 
 # Example OTLP exporter with mutual TLS
-# [otel]
-# exporter = { otlp-http = {
-#   endpoint = "https://otel.example.com/v1/logs",
-#   protocol = "binary",
-#   headers = { "x-otlp-api-key" = "${OTLP_TOKEN}" },
-#   tls = {
-#     ca-certificate = "certs/otel-ca.pem",
-#     client-certificate = "/etc/codex/certs/client.pem",
-#     client-private-key = "/etc/codex/certs/client-key.pem",
-#   }
-# }}
+# [otel.exporter."otlp-http"]
+# endpoint = "https://otel.example.com/v1/logs"
+# protocol = "binary"
+
+# [otel.exporter."otlp-http".headers]
+# "x-otlp-api-key" = "${OTLP_TOKEN}"
+
+# [otel.exporter."otlp-http".tls]
+# ca-certificate = "certs/otel-ca.pem"
+# client-certificate = "/etc/codex/certs/client.pem"
+# client-private-key = "/etc/codex/certs/client-key.pem"
 ```