Update how-to-pronunciation-assessment.md

Author: sally-baolian

articles/ai-services/speech-service/how-to-pronunciation-assessment.md

@@ -385,7 +385,7 @@ This table lists some of the key pronunciation assessment results for the script
 | `FluencyScore` | Fluency of the given speech. Fluency indicates how closely the speech matches a native speaker's use of silent breaks between words. | Full Text level |
 | `CompletenessScore` | Completeness of the speech, calculated by the ratio of pronounced words to the input reference text. |Full Text level|
 | `ProsodyScore` | Prosody of the given speech. Prosody indicates how natural the given speech is, including stress, intonation, speaking speed, and rhythm. | Full Text level|
-| `PronScore` | Overall score of the pronunciation quality of the given speech. `PronScore` is aggregated from `AccuracyScore`, `FluencyScore`, and `CompletenessScore` with weight. |Full Text level|
+| `PronScore` | Overall score of the pronunciation quality of the given speech. `PronScore` is calculated from `AccuracyScore`, `FluencyScore`, `CompletenessScore`, and `ProsodyScore` with weight, provided that `ProsodyScore` and `CompletenessScore` are available. If either of them isn't available, `PronScore` won't consider that score.|Full Text level|
 | `ErrorType` | This value indicates the error type compared to the reference text. Options include whether a word is omitted, inserted, or improperly inserted with a break. It also indicates a missing break at punctuation. It also indicates whether a word is badly pronounced, or monotonically rising, falling, or flat on the utterance. Possible values are `None` for no error on this word, `Omission`, `Insertion`, `Mispronunciation`, `UnexpectedBreak`, `MissingBreak`, and `Monotone`. The error type can be `Mispronunciation` when the pronunciation `AccuracyScore` for a word is below 60.| Word level|
 
 #### Unscripted assessment results
@@ -405,7 +405,7 @@ This table lists some of the key pronunciation assessment results for the unscri
 | `VocabularyScore`  | Proficiency in lexical usage. It evaluates the speaker's effective usage of words and their appropriateness within the given context to express ideas accurately, and the level of lexical complexity. | Full Text level |
 | `GrammarScore`     | Correctness in using grammar and variety of sentence patterns. Lexical accuracy, grammatical accuracy, and diversity of sentence structures jointly elevate grammatical errors. | Full Text level|
 | `TopicScore`       | Level of understanding and engagement with the topic, which provides insights into the speaker’s ability to express their thoughts and ideas effectively and the ability to engage with the topic. | Full Text level|
-| `PronScore`        | Overall score of the pronunciation quality of the given speech. This value is aggregated from `AccuracyScore`, `FluencyScore`, and `CompletenessScore` with weight. | Full Text level |
+| `PronScore`        | Overall score of the pronunciation quality of the given speech. `PronScore` is calculated from `AccuracyScore`, `FluencyScore`, and `ProsodyScore` with weight, provided that `ProsodyScore` is available. If `ProsodyScore` isn't available, `PronScore` won't consider that score.| Full Text level |
 | `ErrorType`        | A word is badly pronounced, improperly inserted with a break, or missing a break at punctuation. It also indicates whether a pronunciation is monotonically rising, falling, or flat on the utterance. Possible values are `None` for no error on this word, `Mispronunciation`, `UnexpectedBreak`, `MissingBreak`, and `Monotone`. | Word level |
 
 The following table describes the prosody assessment results in more detail: