Typo fix for typo fix

Co-Authored-By: Chris Markiewicz <effigies@gmail.com>

src/04-modality-specific-files/01-magnetic-resonance-imaging-data.md

@@ -290,7 +290,7 @@ combined image rather than an image from each coil.
 | NumberOfVolumesDiscardedByScanner | RECOMMENDED. Number of volumes ("dummy scans") discarded by the scanner (as opposed to those discarded by the user post hoc) before saving the imaging file. For example, a sequence that automatically discards the first 4 volumes before saving would have this field as 4. A sequence that doesn't discard dummy scans would have this set to 0. Please note that the onsets recorded in the \_event.tsv file should always refer to the beginning of the acquisition of the first volume in the corresponding imaging file - independent of the value of `NumberOfVolumesDiscardedByScanner` field. |
 | NumberOfVolumesDiscardedByUser    | RECOMMENDED. Number of volumes ("dummy scans") discarded by the user before including the file in the dataset. If possible, including all of the volumes is strongly recommended. Please note that the onsets recorded in the \_event.tsv file should always refer to the beginning of the acquisition of the first volume in the corresponding imaging file - independent of the value of `NumberOfVolumesDiscardedByUser` field.                                                                                                                                                                       |
 | DelayTime                         | RECOMMENDED. User specified time (in seconds) to delay the acquisition of data for the following volume. If the field is not present it is assumed to be set to zero. Corresponds to Siemens CSA header field `lDelayTimeInTR`. This field is REQUIRED for sparse sequences using the `RepetitionTime` field that do not have the `SliceTiming` field set to allowed for accurate calculation of "acquisition time". This field is mutually exclusive with `VolumeTiming`.                                                                                                                               |
-| AcquisitionDuration               | RECOMMENDED. Duration (in seconds) of volume acquisition. Corresponds to DICOM Tag 0018,9073 `Acquisition Duration`. This field is REQUIRED for sequences that are described with the `VolumeTiming` field and that do not have the `SliceTiming` field set to allowed for accurate calculation of "acquisition time". This field is mutually exclusive with `RepetitionTime`.                                                                                                                                                                                                                           |
+| AcquisitionDuration               | RECOMMENDED. Duration (in seconds) of volume acquisition. Corresponds to DICOM Tag 0018,9073 `Acquisition Duration`. This field is REQUIRED for sequences that are described with the `VolumeTiming` field and that do not have the `SliceTiming` field set to allow for accurate calculation of "acquisition time". This field is mutually exclusive with `RepetitionTime`.                                                                                                                                                                                                                             |
 | DelayAfterTrigger                 | RECOMMENDED. Duration (in seconds) from trigger delivery to scan onset. This delay is commonly caused by adjustments and loading times. This specification is entirely independent of `NumberOfVolumesDiscardedByScanner` or `NumberOfVolumesDiscardedByUser`, as the delay precedes the acquisition.                                                                                                                                                                                                                                                                                                    |
 
 The following table recapitulates the different ways that specific fields have