add overview, faq, service limits

Author: laujan

articles/ai-services/content-understanding/service-limits.md

@@ -35,13 +35,13 @@ This article is an Azure AI Content Understanding service reference guide for se
 
 | Supported File Types | File Size | Length |
 | --- | --- |  --- |
-|   ✓  .wav (PCM, A-law, μ-law) <br/>✓  .mp3 <br/>✓ .opus, .ogg (Opus)<br/>✓ .flac <br/>✓  .wma <br/>✓  .aac <br/>✓  .amr (AMR-NB, AMR-WB) <br/>✓ .webm (Opus, Vorbis) <br/>✓  .m4a (AAC, ALAC)<br/>✓ .spx | ≤ 200 MB | ≤ 2 h |
+|   ✓  .wav (`PCM`, A-law, μ-law) <br/>✓  .mp3 <br/>✓ .opus, .ogg (Opus)<br/>✓ .flac <br/>✓  .wma <br/>✓  .aac <br/>✓  .amr (AMR-NB, AMR-WB) <br/>✓ .webm (Opus, Vorbis) <br/>✓  .m4a (`AAC`, `ALAC`)<br/>✓ .spx | ≤ 200 MB | ≤ 2 h |
 
 ### Video
 
 | Supported File Types | File Size | Resolution | Length |
 | ---| --- | --- | --- |
- ✓  .mp4, .m4v <br/>✓  .flv (H.264 and AAC) <br/>✓  .wmv, .asf <br/>✓  .avi <br/>✓  .mkv <br/>✓  .mov  | ≤20 GB † | Min: 320 x 240<br/>Max:1920 x 1080 | ≤2 h †|
+ ✓  .mp4, .m4v <br/>✓  .flv (H.264 and `AAC`) <br/>✓  .wmv, .asf <br/>✓  .avi <br/>✓  .mkv <br/>✓  .mov  | ≤20 GB † | Min: 320 x 240<br/>Max: 1920 x 1080 | ≤2 h †|
 
 † Note: The file size limit is 200 MB and the duration limit is 30 minutes if the video file is included directly in the analysis request.
 
@@ -50,7 +50,7 @@ This article is an Azure AI Content Understanding service reference guide for se
 Content Understanding supports both basic field value types and nested structures, including lists, groups, tables, and fixed tables.
 
 * **Basic field value types**: *string*, *date*, *time*, *number*, *integer*, and *boolean*.
-* **List field**: A sequence of 0 or more values of the same type, represented as an array of basic fields in the API.
+* **List field**: A sequence of values of the same type, represented as an array of basic fields in the API.
 * **Group field**: A set of semantically related fields, represented as an object of basic fields in the API.
 * **Table field**: A variable number of items with fixed subfields, represented as an array of objects of basic fields in the API.
 * **Fixed table field**: A group of fields with shared subfields, represented as an object of objects of basic fields in the API.
@@ -65,7 +65,7 @@ The following limits apply as of version 2024-12-01-preview.
 | Max classify field categories | 300 | 300 | 300 | 300 | 300 |
 | Supported generation methods | extract | generate<br/>classify | generate<br/>classify | generate<br/>classify | generate<br/>classify |
 
-* The *Max fields* limit includes all named fields. For example, a list of strings counts as 1 field, while a group with string and number subfields counts as 3 fields.
+* The *Max fields* limit includes all named fields. For example, a list of strings counts as one field, while a group with string and number subfields counts as three fields.
 * The *Max classify field categories* limit is the total number of categories across all fields using the `classify` generation method.
 * The generation method currently applies only to leaf fields.
 
@@ -79,7 +79,7 @@ The following limits apply as of version 2024-12-01-preview.
 | Table | No *boolean* | All | *string* | *string* | All
 | Fixed table | No *boolean* | N/A | N/A | N/A | N/A |
 
-* Document analyzers do not support *boolean* leaf fields.
+* Document analyzers don't support *boolean* leaf fields.
 * Only document analyzers support fixed tables.
 * Image and video analyzers support all field structures except fixed tables.
 * Text and audio analyzers support all nested structures with *string* leaf fields, except fixed tables.
@@ -89,7 +89,7 @@ The following limits apply as of version 2024-12-01-preview.
 Classification fields can be defined to return either a single category (single-label classification) or multiple categories (multi-label classification).
 
 * **Single-label classification**: Defined using a string field with the `classify` method. It can be a top-level basic field or a subfield within a group or table.
-* **Multi-label classification**: Represented as a list of string fields with the `classify` method. In the REST API, `method=classify` and `enum` are specified on the inner string field. This can only be a top-level field.
+* **Multi-label classification**: Represented as a list of string fields with the `classify` method. In the REST API, `method=classify` and `enum` are specified on the inner string field. This classification can only be a top-level field.
 
    > [!NOTE]
    > Document analyzers currently don't support classification fields.
@@ -103,5 +103,5 @@ Classification fields can be defined to return either a single category (single-
 | Quota | Standard (S0) |
 | --- | --- |
 | Max analyzers | 100k |
-| Max analysis/min | 1000 pages/images <br/> 4 hours of audio <br/> 1 hour of video  |
+| Max analysis/min | 1000 pages/images <br/> Four hours of audio <br/> One hour of video  |
 | Max operations/min | 3000 |