staking_pools: add descriptions

models/descriptions/staking_pool_address.md

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+{% docs staking_pool_address %}
+
+The address of the staking pool.
+
+{% enddocs %}

models/descriptions/staking_pool_owner.md

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+{% docs staking_pool_owner %}
+
+The account of the staking pool owner.
+
+{% enddocs %}

models/descriptions/staking_pool_reward_fee_fraction.md

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+{% docs staking_pool_reward_fee_fraction %}
+
+An object representing the fraction of the reward fee taken by the staking pool.
+
+{% enddocs %}

models/descriptions/staking_pool_tx_type.md

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+{% docs staking_pool_tx_type %}
+
+The type of transaction involving this staking pool.
+Either `"Create"` for staking pool creation or `"Update"` for `reward_fee_fraction` updates.
+
+{% enddocs %}