Doc/optimize doc for ble (IDFGH-13260)

[esp-zbw]

Add summary list of examples on ble and ble_50 Modified api about ble_gap: esp_gap_ble_api.h, btc_gap_ble.h

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Warnings

:warning:

Some issues found for the commit messages in this PR: the commit message "doc(bt/bluedroid): Add readme files for BLE examples": type/action should be one of [change, ci, docs, feat, fix, refactor, remove, revert, test] the commit message "modified notes about esp_gap_ble_api": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

	Messages
:book:	This PR seems to be quite large (total lines of code: 5778), you might consider splitting it into smaller PRs

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