docs: Inline code spans are not blocks.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

templates/zerver/help/code-blocks.md

@@ -1,10 +1,10 @@
-# Code blocks
+# Code spans and blocks
 
-Zulip supports the standard [Markdown syntax][markdown] for code
-blocks:
+Zulip supports the standard [Markdown syntax][markdown] for inline
+code spans and code blocks:
 
 ~~~
-Inline: `let x = 5`
+Inline code span: `let x = 5`
 
 Code block:
 ```
@@ -24,7 +24,7 @@ Sending the above message in Zulip will render like this:
 
 ![Markdown code](/static/images/help/markdown-code.png)
 
-You can also use `~~~` to start codeblocks, or just indent the code 4 or more
+You can also use `~~~` to start code blocks, or just indent the code 4 or more
 spaces.
 
 A widget in the upper-right corner of code blocks allows you to easily

templates/zerver/help/format-your-message-using-markdown.md

@@ -1,7 +1,7 @@
 # Format your messages
 
 [//]: # (All screenshots here require line-height: 22px and font-size: 16px in .message-content.)
-[//]: # (Requires some additional fiddling for the LaTeX picture, inline code block, and maybe a few others.)
+[//]: # (Requires some additional fiddling for the LaTeX picture, inline code span, and maybe a few others.)
 
 Zulip uses a variant of
 [GitHub Flavored Markdown](https://github.com/adam-p/markdown-here/wiki/Markdown-Cheatsheet)
@@ -107,7 +107,7 @@ def fib(n):
 
 ![Markdown code](/static/images/help/markdown-code.png)
 
-You can also use `~~~` to start codeblocks, or just indent the code 4 or more spaces.
+You can also use `~~~` to start code blocks, or just indent the code 4 or more spaces.
 
 See the main [code blocks article](/help/code-blocks) for details on
 [syntax highlighting](/help/code-blocks#language-tagging), [code

zerver/lib/markdown/__init__.py

@@ -567,7 +567,7 @@ class BacktickInlineProcessor(markdown.inlinepatterns.BacktickInlineProcessor):
         # Let upstream's implementation do its job as it is, we'll
         # just replace the text to not strip the group because it
         # makes it impossible to put leading/trailing whitespace in
-        # an inline code block.
+        # an inline code span.
         el, start, end = ret = super().handleMatch(m, data)
         if el is not None and m.group(3):
             # upstream's code here is: m.group(3).strip() rather than m.group(3).