EUCLIDPCR-1863 fix Title level inconsistent:

Author: Jorge Fernandez Hernandez

docs/esa/euclid/euclid.rst

@@ -91,7 +91,7 @@ It is highly recommended checking the status of Euclid TAP before executing this
 This method will retrieve the same warning messages shown in EUCLID Science Archive with information about service degradation.
 
 
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 0. Euclid science archive systems
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@@ -139,7 +139,7 @@ makes use of the *PDR* environment. In order to make use of a different one, it
 The parameter *environment* can take only the following values: *IDR*, *OTF*, *PDR* or *REG*.
 
 
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 1. Non authenticated access
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@@ -569,7 +569,8 @@ Note: to obtain the current location, type:
   >>> print(os.getcwd())
   /Current/directory/path
 
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 2. Authenticated access
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@@ -1146,11 +1147,10 @@ will be able to access to your shared table in a query.
   >>> Euclid.share_table_stop(table_name="user_<user_login_name>.my_table", group_name="my_group")
 
 
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 3. Datalink service (Authenticated)
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 DataLink_ is a data access protocol compliant with the IVOA_ architecture that provides a linking mechanism between
 datasets offered by different services. In practice, it can be seen and used as a web service providing the list of additional
 data products available for each object outside the main catalogue(s). For more information about the products served via