docs(manual): fix typos and clarifications (#391)

docs/manual.md

@@ -117,7 +117,7 @@ The client presents the interface for communicating with the data source to the
 A connection to a data source is prepared by creating an instance of `tagreader.IMSClient` with the following input arguments:
 
 * `datasource` : Name of data source
-* `imstype` (optional): The name of the [IMS type](#ims-types) to query. Indicates the type of data source that is requested, and therefore determines which handler type to use. Valid values are `piwebapi` and `aspenone`. If not provided it will search the availble sources and find the type.
+* `imstype` (optional): The name of the [IMS type](#ims-types) to query. Indicates the type of data source that is requested, and therefore determines which handler type to use. Valid values are `piwebapi` and `aspenone`. If not provided it will search the available sources and find the type.
 * `tz` (optional): Time zone naive time stamps will be interpreted as belonging to this time zone. Similarly, the returned data points will be localized to this time zone. **Default**: _"Europe/Oslo"_.
 
 The following input arguments can be used when connecting to either `piwebapi` or to `aspenone`. None of these should be necessary to supply when connecting to Equinor servers.
@@ -209,7 +209,7 @@ Data is read by calling the client method `read()` with the following input argu
 By specifying the optional parameter `read_type` to `read()` , it is possible to specify what kind of data should be returned. The default query method is interpolated. All valid values for `read_type` are defined in the `utils.ReaderType` class (mirrored for convenience as `tagreader.ReaderType` ), although not all are currently implemented. Below is the list of implemented read types.
 
 * `INT` : The raw data points are interpolated so that one new data point is generated at each step of length `ts` starting at `start_time` and ending at or less than `ts` seconds before `end_time` .
-* The following aggregated read types perform a weighted calculation of the raw data within each interval. Where relevant, time-weighted calculations are used. Returned time stamps are anchored at the beginning of each interval. So for the 60 seconds long interval between 08:11:00 and 08:12:00, the time stamp will be 08:11:00.
+* The following aggregated read types perform a weighted calculation of the raw data within each interval, using time-weighted calculations where applicable. Returned timestamps are anchored at the beginning of each interval. For example, for a 60-second interval from 08:11:00 to 08:12:00, the timestamp will be 08:11:00.
   + `MIN` : The minimum value.
   + `MAX` : The maximum value.
   + `AVG` : The average value.