second shot at making the definitions more clear

_data/glossary/en/sighash-anyonecanpay.yaml

@@ -7,8 +7,7 @@ required:
     title_max_40_characters_no_formatting: SIGHASH_ANYONECANPAY
 
     summary_max_255_characters_no_formatting: >
-        A signature hash type which modifies the behavior of other signature hash types
-        to allow signing only the current input.
+        A signature hash type which signs only the current input.
 
     synonyms_shown_in_glossary_capitalize_first_letter:
         - SIGHASH_ANYONECANPAY
@@ -37,7 +36,7 @@ optional:
         - "`sighash_single|sighash_anyonecanpay`"
 
     not_to_be_confused_with_capitalize_first_letter:
-        - SIGHASH_SINGLE (which signs only a single output while allowing the sequence number of other inputs to be updated)
+        - SIGHASH_SINGLE (which signs this input, its corresponding output, and other inputs partially)
 
     links_html_or_markdown_style_capitalize_first_letter:
         - "[SIGHASH_ANYONECANPAY](/en/developer-guide#term-sighash-anyonecanpay) --- Bitcoin.org Developer Guide"

_data/glossary/en/sighash-single.yaml

@@ -7,10 +7,10 @@ required:
     title_max_40_characters_no_formatting: SIGHASH_SINGLE
 
     summary_max_255_characters_no_formatting: >
-        Signature hash type which signs all of the inputs, but only the one
-        output corresponding to this input (the one with the same index value),
-        allowing modification of other outputs and the sequence number of other
-        inputs.
+        Signature hash type which signs the output corresponding to this input
+        (the one with the same index value), this input, and any other inputs
+        partially. Allows modification of other outputs. The partial signing of
+        other inputs allows modification of their sequence numbers.
 
     synonyms_shown_in_glossary_capitalize_first_letter:
         - SIGHASH_SINGLE

_includes/guide_transactions.md

@@ -518,12 +518,13 @@ currently available:
   signatures using other signature hash flags protect the outputs.
 
 * [`SIGHASH_SINGLE`][/en/glossary/sighash-single]{:#term-sighash-single}{:.term}
-  signs only the output corresponding to this input (the output
-  with the same output index number as the input), ensuring
-  nobody can change your part of the transaction but allowing other
-  signers to change their part of the transaction. The corresponding
-  output must exist or the value "1" will be signed, breaking the security
-  scheme. The sequence numbers of other inputs are not signed and can be updated.
+  the only output signed is the one corresponding to this input (the output
+  with the same output index number as this input), ensuring nobody can change
+  your part of the transaction but allowing other signers to change their part
+  of the transaction. The corresponding output must exist or the value "1" will
+  be signed, breaking the security scheme. This input, as well as other inputs,
+  are included in the signature. The sequence numbers of other inputs are not
+  included in the signature, and can be updated.
 
 The base types can be modified with the [`SIGHASH_ANYONECANPAY`][/en/glossary/sighash-anyonecanpay]{:#term-sighash-anyonecanpay}{:.term} (anyone can
 pay) flag, creating three new combined types: