Fix some errors. (#5802)

Judgements can be valid as well as invalid. 
Refine doesn’t have environmental awareness. 
Accumulate cannot currently invoke PVM.

docs/learn/learn-jam-chain.md

@@ -106,9 +106,8 @@ The first three types form part of the JAM chain's security framework. Guarantee
 involve validators collectively attesting that a work result accurately reflects the outcome of its
 corresponding work item after transformation through the service's refine function.
 
-Judgments occur when a work result does not align with its intended work item and has already been
-integrated into the service’s state. A rollback is necessary in such cases, and the result’s
-invalidity is recorded. Judgments must occur within one hour of submitting the work report to the
+Judgments occur when then integrity of a work result is considered uncertain and a large plurality of validators attest to its validity or lack thereof. In this case an invalid work item may already have been
+integrated into the service’s state and a rollback may need to happen. Judgments must occur within one hour of submitting the work report to the
 chain, during which finality is temporarily paused.
 
 Preimages represent a feature provided by the JAM chain for the refine function. While the refine
@@ -122,24 +121,19 @@ algorithm.
 
 ### Refine Function
 
-In the Refine processing stage within JAM, up to 5 MB of data can be accepted during each time slot,
-which lasts 6 seconds. However, Refine yields a maximum of 4 kB of data, resulting in significant
+In the Refine processing stage within JAM, up to 15 MB of data can be accepted during each time slot,
+which lasts 6 seconds. However, Refine yields a maximum of 90 kB of data, resulting in significant
 data compaction that is necessary due to the distributed nature of
 [the availability system](./learn-parachains-protocol.md#availability-and-validity-anv-protocol).
-For instance, in the context of a parachain, the 5 MB of data represents the
-[Proof of Validity (PoV)](./learn-parachains-protocol.md#protocols-summary), while the 4 kB of data
+For instance, in the context of a parachain, the 15 MB of data represents the
+[Proof of Validity (PoV)](./learn-parachains-protocol.md#protocols-summary), while the 90 kB of data
 corresponds to the [candidate receipt](./learn-parachains-protocol.md#candidate-receipts).
 
 Refine can execute for up to 6 seconds of [PVM](#polkadot-virtual-machine-pvm) gas, equivalent to
 the full block period of the relay chain. This extended execution time, compared to the current
 limit of two seconds for PVFs, is facilitated by [secure metering](#benchmarks-vs-metering) and
 other optimizations inherent to PVM.
 
-Moreover, Refine receives contextual information about the ongoing work and its surroundings,
-including details about concurrent refinements being performed. This feature enables the
-construction of work packages containing multiple work items from various services, facilitating
-interactions like [accords](#accords) and synchronous communication between services.
-
 Preimage lookups can also be conducted within Refine. If a hash and its associated preimage are
 believed to be available on the JAM chain, the preimage can be requested by providing the hash. This
 capability enables efficient storage and retrieval of code, such as parachain code, by storing the
@@ -163,7 +157,7 @@ storage from any service, write to its key-value store, transfer funds, and incl
 transfers. Additionally, Accumulate can create new services, upgrade its code, and request preimage
 availability, among other functionalities.
 
-Moreover, both Refine and Accumulate can invoke child instances of the PVM. This allows for creating
+Moreover, Refine can invoke child instances of the PVM. This allows for creating
 sub-instances, or virtual machines, where code and data can be deployed, memory and stack
 configurations can be customized, and computations can be executed within a flexible framework.