docs(spanner-jdbc): update connection_properties.md documentation - #14035

🤖 I have created a release *beep* *boop*
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<details><summary>1.90.0</summary>

##
[1.90.0](v1.89.0...v1.90.0)
(2026-08-24)


### Features

* **bigquery-jdbc:** implement TypeRegistry and TypeDescriptor
([#13947](#13947))
([0557e69](0557e69))
* **bigquery:** add QueryResultsFormat and ArrowSerializationOptions
configurations
([#13942](#13942))
([ff03e19](ff03e19))
* **bigquery:** expose `StatementType` and query execution stats on
`TableResult`
([#14145](#14145))
([7d16de8](7d16de8))
* **bigtable:** enable microsecond timestamps in client
([#14057](#14057))
([57aaf8d](57aaf8d))
* **bigtable:** route single-entry MutateRows through a point-write c…
([#14028](#14028))
([a403703](a403703))
* **datastore:** add support for request tags
([#13732](#13732))
([b1f6186](b1f6186))
* **ftp:** onboard a new library
([#14068](#14068))
([f41b2d9](f41b2d9))
* **gax:** add ResumableUploadCallable and ResumableUploadCallSettings
([#14052](#14052))
([a5e26e8](a5e26e8))
* **google/cloud/biglake/hive/v1:** onboard a new library
([#14130](#14130))
([650c839](650c839))
* **google/maps/mapmanagement/v2:** onboard a new library
([#14131](#14131))
([7d00726](7d00726))
* **spanner:** support user-provided OpenTelemetry for client metrics
export
([#13741](#13741))
([da74dee](da74dee))
* update API sources and regenerate
([#14000](#14000))
([9337a93](9337a93))
* **workloadidentity:** onboard a new library
([#14060](#14060))
([ab226ee](ab226ee))


### Bug Fixes

* add documentation for insertall api that there's no default retry
([#13953](#13953))
([1fdb4f1](1fdb4f1))
* add retry behavior documentation to insertall interface to clarify the
behavior
([#14058](#14058))
([1b8f9e3](1b8f9e3))
* **auth:** fix JSpecify nullability in UserAuthorizer and TokenStore
([#14150](#14150))
([0d5fac0](0d5fac0))
* **auth:** fix remaining nullability in UserAuthorizer and Builder
([#14158](#14158))
([a51bb8d](a51bb8d))
* **auth:** refine JSpecify nullability for ServiceAccountCredentials
and UserCredentials
([#14159](#14159))
([a929250](a929250))
* **bigquery-jdbc:** enable ITOpenTelemetryTest
([#13991](#13991))
([fa6641b](fa6641b))
* **bigquery-jdbc:** pass connection proxy settings to OpenTelemetry
exporters
([#14011](#14011))
([115b9b3](115b9b3))
* **bigquery-jdbc:** session context propagation when session is enabled
([#14161](#14161))
([1e74dda](1e74dda))
* **bigtable:** remove heartbeat miss logging
([#14054](#14054))
([ec17637](ec17637))
* **deps:** update dependency
com.google.apis:google-api-services-bigquery to v2-rev20260731-2.0.0
([#14149](#14149))
([95f6c38](95f6c38))
* **deps:** update dependency com.google.cloud:libraries-bom to v26.86.0
([#14103](#14103))
([cf5697e](cf5697e))
* **gax-httpjson:** reduce Conscrypt fallback error to debug level
([#13962](#13962))
([8236771](8236771))
* **gax-httpjson:** remove unsupported and deprecated PQC named groups
([#14107](#14107))
([7604971](7604971))
* **gax:** register Conscrypt SSLContext SPI classes for GraalVM
reflection
([#14129](#14129))
([73c0243](73c0243))
* **samples:** align native profile junit and surefire versions with
shared config
([#14096](#14096))
([2b84133](2b84133))
* **spanner:** add closeAsync to ReadContext and make transaction
closing non-blocking
([#14076](#14076))
([671f892](671f892))
* **spanner:** scope server-timing metrics per call and guard
interceptor lifecycle callbacks
([#14053](#14053))
([f35c570](f35c570))
* **storage:** use JsonUtils for StorageObject serialization in
resumable writes and read channels
([#13976](#13976))
([d94922f](d94922f))


### Performance Improvements

* **bigquery-jdbc:** eliminate dry run to resolve statement type
([#14156](#14156))
([7109ecd](7109ecd))
* **spanner-jdbc:** cache commonly used query parameter names
([#14036](#14036))
([1eb6aa3](1eb6aa3))
* **spanner-jdbc:** cache JDBC metadata query strings
([#14041](#14041))
([31c628f](31c628f))
* **spanner-jdbc:** cache positional to named param conversion
([#14034](#14034))
([30e031b](30e031b))


### Dependencies

* **gax-httpjson:** upgrade conscrypt-openjdk-uber to 2.6.2
([#14117](#14117))
([2f5481a](2f5481a))
* Update gRPC to v1.82.3
([#13997](#13997))
([a786107](a786107))
* Upgrade gRPC to v1.82.4
([#14088](#14088))
([0c482fe](0c482fe))


### Documentation

* **bigquery-jdbc:** add user guide with connection property and custom
endpoint reference
([#13878](#13878))
([2dde172](2dde172))
* **gax:** update LRO troubleshooting documentation link
([#14108](#14108))
([4c5bbae](4c5bbae))
* **spanner-jdbc:** update connection_properties.md documentation
([#14035](#14035))
([b576fe8](b576fe8))
* **spanner:** update CHANGELOG.md for releases 6.117.0 through 6.120.0
([#13970](#13970))
([2413811](2413811))
</details>

---
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Please](https://github.com/googleapis/release-please). See
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Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>